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WEB ACCESSIBLE PERIODIC TABLE


A PERIODIC TABLE WITH ELEMENTS BROWSABLE BY SCREEN READERS

 * Hydrogen
 * Helium
 * Lithium
 * Beryllium
 * Boron
 * Carbon
 * Nitrogen
 * Oxygen
 * Fluorine
 * Neon
 * Sodium
 * Magnesium
 * Aluminium
 * Silicon
 * Phosphorus
 * Sulfur
 * Chlorine
 * Argon
 * Potassium
 * Calcium
 * Scandium
 * Titanium
 * Vanadium
 * Chromium
 * Manganese
 * Iron
 * Cobalt
 * Nickel
 * Copper
 * Zinc
 * Gallium
 * Germanium
 * Arsenic
 * Selenium
 * Bromine
 * Krypton
 * Rubidium
 * Strontium
 * Yttrium
 * Zirconium
 * Niobium
 * Molybdenum
 * Technetium
 * Ruthenium
 * Rhodium
 * Palladium
 * Silver
 * Cadmium
 * Indium
 * Tin
 * Antimony
 * Tellurium
 * Iodine
 * Xenon
 * Cesium
 * Barium
 * Lanthanum
 * Cerium
 * Praseodymium
 * Neodymium
 * Promethium
 * Samarium
 * Europium
 * Gadolinium
 * Terbium
 * Dysprosium
 * Holmium
 * Erbium
 * Thulium
 * Ytterbium
 * Lutetium
 * Hafnium
 * Tantalum
 * Tungsten
 * Rhenium
 * Osmium
 * Iridium
 * Platinum
 * Gold
 * Mercury
 * Thallium
 * Lead
 * Bismuth
 * Polonium
 * Astatine
 * Radon
 * Francium
 * Radium
 * Actinium
 * Thorium
 * Protactinium
 * Uranium
 * Neptunium
 * Plutonium
 * Americium
 * Curium
 * Berkelium
 * Californium
 * Einsteinium
 * Fermium
 * Mendelevium
 * Nobelium
 * Lawrencium
 * Rutherfordium
 * Dubnium
 * Seaborgium
 * Bohrium
 * Hassium
 * Meitnerium
 * Darmstadtium
 * Roentgenium
 * Copernicium
 * Nihonium
 * Flerovium
 * Moscovium
 * Livermorium
 * Tennessine
 * Oganesson
 * Ununennium

1
H
Hydrogen
1.008

About the element Hydrogen: Hydrogen is a chemical element with chemical symbol
H and atomic number 1. With an atomic weight of 1.00794 u, hydrogen is the
lightest element on the periodic table. Its monatomic form (H) is the most
abundant chemical substance in the Universe, constituting roughly 75% of all
baryonic mass.

















2
He
Helium
4.0026022

About the element Helium: Helium is a chemical element with symbol He and atomic
number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic
gas that heads the noble gas group in the periodic table. Its boiling and
melting points are the lowest among all the elements.

3
Li
Lithium
6.94

About the element Lithium: Lithium (from Greek:λίθος lithos, "stone") is a
chemical element with the symbol Li and atomic number 3. It is a soft,
silver-white metal belonging to the alkali metal group of chemical elements.
Under standard conditions it is the lightest metal and the least dense solid
element.

4
Be
Beryllium
9.01218315

About the element Beryllium: Beryllium is a chemical element with symbol Be and
atomic number 4. It is created through stellar nucleosynthesis and is a
relatively rare element in the universe. It is a divalent element which occurs
naturally only in combination with other elements in minerals.











5
B
Boron
10.81

About the element Boron: Boron is a metalloid chemical element with symbol B and
atomic number 5. Produced entirely by cosmic ray spallation and supernovae and
not by stellar nucleosynthesis, it is a low-abundance element in both the Solar
system and the Earth's crust. Boron is concentrated on Earth by the
water-solubility of its more common naturally occurring compounds, the borate
minerals.

6
C
Carbon
12.011

About the element Carbon: Carbon (from Latin:carbo "coal") is a chemical element
with symbol C and atomic number 6. On the periodic table, it is the first (row
2) of six elements in column (group) 14, which have in common the composition of
their outer electron shell. It is nonmetallic and tetravalent—making four
electrons available to form covalent chemical bonds.

7
N
Nitrogen
14.007

About the element Nitrogen: Nitrogen is a chemical element with symbol N and
atomic number 7. It is the lightest pnictogen and at room temperature, it is a
transparent, odorless diatomic gas. Nitrogen is a common element in the
universe, estimated at about seventh in total abundance in the Milky Way and the
Solar System.

8
O
Oxygen
15.999

About the element Oxygen: Oxygen is a chemical element with symbol O and atomic
number 8. It is a member of the chalcogen group on the periodic table and is a
highly reactive nonmetal and oxidizing agent that readily forms compounds
(notably oxides) with most elements. By mass, oxygen is the third-most abundant
element in the universe, after hydrogen and helium.

9
F
Fluorine
18.9984031636

About the element Fluorine: Fluorine is a chemical element with symbol F and
atomic number 9. It is the lightest halogen and exists as a highly toxic pale
yellow diatomic gas at standard conditions. As the most electronegative element,
it is extremely reactive:almost all other elements, including some noble gases,
form compounds with fluorine.

10
Ne
Neon
20.17976

About the element Neon: Neon is a chemical element with symbol Ne and atomic
number 10. It is in group 18 (noble gases) of the periodic table. Neon is a
colorless, odorless, inert monatomic gas under standard conditions, with about
two-thirds the density of air.

11
Na
Sodium
22.989769282

About the element Sodium: Sodium /ˈsoʊdiəm/ is a chemical element with symbol Na
(from Ancient Greek Νάτριο) and atomic number 11. It is a soft, silver-white,
highly reactive metal. In the Periodic table it is in column 1 (alkali metals),
and shares with the other six elements in that column that it has a single
electron in its outer shell, which it readily donates, creating a positively
charged atom - a cation.

12
Mg
Magnesium
24.305

About the element Magnesium: Magnesium is a chemical element with symbol Mg and
atomic number 12. It is a shiny gray solid which bears a close physical
resemblance to the other five elements in the second column (Group 2, or
alkaline earth metals) of the periodic table:they each have the same electron
configuration in their outer electron shell producing a similar crystal
structure. Magnesium is the ninth most abundant element in the universe.











13
Al
Aluminium
26.98153857

About the element Aluminium: Aluminium (or aluminum; see different endings) is a
chemical element in the boron group with symbol Al and atomic number 13. It is a
silvery-white, soft, nonmagnetic, ductile metal. Aluminium is the third most
abundant element (after oxygen and silicon), and the most abundant metal, in the
Earth's crust.

14
Si
Silicon
28.085

About the element Silicon: Silicon is a chemical element with symbol Si and
atomic number 14. It is a tetravalent metalloid, more reactive than germanium,
the metalloid directly below it in the table. Controversy about silicon's
character dates to its discovery.

15
P
Phosphorus
30.9737619985

About the element Phosphorus: Phosphorus is a chemical element with symbol P and
atomic number 15. As an element, phosphorus exists in two major forms—white
phosphorus and red phosphorus—but due to its high reactivity, phosphorus is
never found as a free element on Earth. Instead phosphorus-containing minerals
are almost always present in their maximally oxidised state, as inorganic
phosphate rocks.

16
S
Sulfur
32.06

About the element Sulfur: Sulfur or sulphur (see spelling differences) is a
chemical element with symbol S and atomic number 16. It is an abundant,
multivalent non-metal. Under normal conditions, sulfur atoms form cyclic
octatomic molecules with chemical formula S8.

17
Cl
Chlorine
35.45

About the element Chlorine: Chlorine is a chemical element with symbol Cl and
atomic number 17. It also has a relative atomic mass of 35.5. Chlorine is in the
halogen group (17) and is the second lightest halogen following fluorine.

18
Ar
Argon
39.9481

About the element Argon: Argon is a chemical element with symbol Ar and atomic
number 18. It is in group 18 of the periodic table and is a noble gas. Argon is
the third most common gas in the Earth's atmosphere, at 0.934% (9,340 ppmv),
making it over twice as abundant as the next most common atmospheric gas, water
vapor (which averages about 4000 ppmv, but varies greatly), and 23 times as
abundant as the next most common non-condensing atmospheric gas, carbon dioxide
(400 ppmv), and more than 500 times as abundant as the next most common noble
gas, neon (18 ppmv).

19
K
Potassium
39.09831

About the element Potassium: Potassium is a chemical element with symbol K
(derived from Neo-Latin, kalium) and atomic number 19. It was first isolated
from potash, the ashes of plants, from which its name is derived. In the
Periodic table, potassium is one of seven elements in column (group) 1 (alkali
metals):they all have a single valence electron in their outer electron shell,
which they readily give up to create an atom with a positive charge - a cation,
and combine with anions to form salts.

20
Ca
Calcium
40.0784

About the element Calcium: Calcium is a chemical element with symbol Ca and
atomic number 20. Calcium is a soft gray alkaline earth metal,
fifth-most-abundant element by mass in the Earth's crust. The ion Ca2+ is also
the fifth-most-abundant dissolved ion in seawater by both molarity and mass,
after sodium, chloride, magnesium, and sulfate.

21
Sc
Scandium
44.9559085

About the element Scandium: Scandium is a chemical element with symbol Sc and
atomic number 21. A silvery-white metallic d-block element, it has historically
been sometimes classified as a rare earth element, together with yttrium and the
lanthanoids. It was discovered in 1879 by spectral analysis of the minerals
euxenite and gadolinite from Scandinavia.

22
Ti
Titanium
47.8671

About the element Titanium: Titanium is a chemical element with symbol Ti and
atomic number 22. It is a lustrous transition metal with a silver color, low
density and high strength. It is highly resistant to corrosion in sea water,
aqua regia and chlorine.

23
V
Vanadium
50.94151

About the element Vanadium: Vanadium is a chemical element with symbol V and
atomic number 23. It is a hard, silvery grey, ductile and malleable transition
metal. The element is found only in chemically combined form in nature, but once
isolated artificially, the formation of an oxide layer stabilizes the free metal
somewhat against further oxidation.

24
Cr
Chromium
51.99616

About the element Chromium: Chromium is a chemical element with symbol Cr and
atomic number 24. It is the first element in Group 6. It is a steely-gray,
lustrous, hard and brittle metal which takes a high polish, resists tarnishing,
and has a high melting point.

25
Mn
Manganese
54.9380443

About the element Manganese: Manganese is a chemical element with symbol Mn and
atomic number 25. It is not found as a free element in nature; it is often found
in combination with iron, and in many minerals. Manganese is a metal with
important industrial metal alloy uses, particularly in stainless steels.

26
Fe
Iron
55.8452

About the element Iron: Iron is a chemical element with symbol Fe (from
Latin:ferrum) and atomic number 26. It is a metal in the first transition
series. It is by mass the most common element on Earth, forming much of Earth's
outer and inner core.

27
Co
Cobalt
58.9331944

About the element Cobalt: Cobalt is a chemical element with symbol Co and atomic
number 27. Like nickel, cobalt in the Earth's crust is found only in chemically
combined form, save for small deposits found in alloys of natural meteoric iron.
The free element, produced by reductive smelting, is a hard, lustrous,
silver-gray metal.

28
Ni
Nickel
58.69344

About the element Nickel: Nickel is a chemical element with symbol Ni and atomic
number 28. It is a silvery-white lustrous metal with a slight golden tinge.
Nickel belongs to the transition metals and is hard and ductile.

29
Cu
Copper
63.5463

About the element Copper: Copper is a chemical element with symbol Cu (from
Latin:cuprum) and atomic number 29. It is a soft, malleable and ductile metal
with very high thermal and electrical conductivity. A freshly exposed surface of
pure copper has a reddish-orange color.

30
Zn
Zinc
65.382

About the element Zinc: Zinc, in commerce also spelter, is a chemical element
with symbol Zn and atomic number 30. It is the first element of group 12 of the
periodic table. In some respects zinc is chemically similar to magnesium:its ion
is of similar size and its only common oxidation state is +2.

31
Ga
Gallium
69.7231

About the element Gallium: Gallium is a chemical element with symbol Ga and
atomic number 31. Elemental gallium does not occur in free form in nature, but
as the gallium(III) compounds that are in trace amounts in zinc ores and in
bauxite. Gallium is a soft, silvery metal, and elemental gallium is a brittle
solid at low temperatures, and melts at 29.76 °C (85.57 °F) (slightly above room
temperature).

32
Ge
Germanium
72.6308

About the element Germanium: Germanium is a chemical element with symbol Ge and
atomic number 32. It is a lustrous, hard, grayish-white metalloid in the carbon
group, chemically similar to its group neighbors tin and silicon. Purified
germanium is a semiconductor, with an appearance most similar to elemental
silicon.

33
As
Arsenic
74.9215956

About the element Arsenic: Arsenic is a chemical element with symbol As and
atomic number 33. Arsenic occurs in many minerals, usually in conjunction with
sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid.

34
Se
Selenium
78.9718

About the element Selenium: Selenium is a chemical element with symbol Se and
atomic number 34. It is a nonmetal with properties that are intermediate between
those of its periodic table column-adjacent chalcogen elements sulfur and
tellurium. It rarely occurs in its elemental state in nature, or as pure ore
compounds.

35
Br
Bromine
79.904

About the element Bromine: Bromine (from Ancient Greek:βρῶμος, brómos, meaning
"stench") is a chemical element with symbol Br, and atomic number 35. It is a
halogen. The element was isolated independently by two chemists, Carl Jacob
Löwig and Antoine Jerome Balard, in 1825–1826.

36
Kr
Krypton
83.7982

About the element Krypton: Krypton (from Greek:κρυπτός kryptos "the hidden one")
is a chemical element with symbol Kr and atomic number 36. It is a member of
group 18 (noble gases) elements. A colorless, odorless, tasteless noble gas,
krypton occurs in trace amounts in the atmosphere, is isolated by fractionally
distilling liquefied air, and is often used with other rare gases in fluorescent
lamps.

37
Rb
Rubidium
85.46783

About the element Rubidium: Rubidium is a chemical element with symbol Rb and
atomic number 37. Rubidium is a soft, silvery-white metallic element of the
alkali metal group, with an atomic mass of 85.4678. Elemental rubidium is highly
reactive, with properties similar to those of other alkali metals, such as very
rapid oxidation in air.

38
Sr
Strontium
87.621

About the element Strontium: Strontium is a chemical element with symbol Sr and
atomic number 38. An alkaline earth metal, strontium is a soft silver-white or
yellowish metallic element that is highly reactive chemically. The metal turns
yellow when it is exposed to air.

39
Y
Yttrium
88.905842

About the element Yttrium: Yttrium is a chemical element with symbol Y and
atomic number 39. It is a silvery-metallic transition metal chemically similar
to the lanthanides and it has often been classified as a "rare earth element".
Yttrium is almost always found combined with the lanthanides in rare earth
minerals and is never found in nature as a free element.

40
Zr
Zirconium
91.2242

About the element Zirconium: Zirconium is a chemical element with symbol Zr and
atomic number 40. The name of zirconium is taken from the name of the mineral
zircon, the most important source of zirconium. The word zircon comes from the
Persian word zargun زرگون, meaning "gold-colored".

41
Nb
Niobium
92.906372

About the element Niobium: Niobium, formerly columbium, is a chemical element
with symbol Nb (formerly Cb) and atomic number 41. It is a soft, grey, ductile
transition metal, which is often found in the pyrochlore mineral, the main
commercial source for niobium, and columbite. The name comes from Greek
mythology:Niobe, daughter of Tantalus since it is so similar to tantalum.

42
Mo
Molybdenum
95.951

About the element Molybdenum: Molybdenum is a chemical element with symbol Mo
and atomic number 42. The name is from Neo-Latin molybdaenum, from Ancient Greek
Μόλυβδος molybdos, meaning lead, since its ores were confused with lead ores.
Molybdenum minerals have been known throughout history, but the element was
discovered (in the sense of differentiating it as a new entity from the mineral
salts of other metals) in 1778 by Carl Wilhelm Scheele.

43
Tc
Technetium
98

About the element Technetium: Technetium (/tɛkˈniːʃiəm/) is a chemical element
with symbol Tc and atomic number 43. It is the element with the lowest atomic
number in the periodic table that has no stable isotopes:every form of it is
radioactive. Nearly all technetium is produced synthetically, and only minute
amounts are found in nature.

44
Ru
Ruthenium
101.072

About the element Ruthenium: Ruthenium is a chemical element with symbol Ru and
atomic number 44. It is a rare transition metal belonging to the platinum group
of the periodic table. Like the other metals of the platinum group, ruthenium is
inert to most other chemicals.

45
Rh
Rhodium
102.905502

About the element Rhodium: Rhodium is a chemical element with symbol Rh and
atomic number 45. It is a rare, silvery-white, hard, and chemically inert
transition metal. It is a member of the platinum group.

46
Pd
Palladium
106.421

About the element Palladium: Palladium is a chemical element with symbol Pd and
atomic number 46. It is a rare and lustrous silvery-white metal discovered in
1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was
itself named after the epithet of the Greek goddess Athena, acquired by her when
she slew Pallas.

47
Ag
Silver
107.86822

About the element Silver: Silver is a chemical element with symbol Ag
(Greek:άργυρος árguros, Latin:argentum, both from the Indo-European root *h₂erǵ-
for "grey" or "shining") and atomic number 47. A soft, white, lustrous
transition metal, it possesses the highest electrical conductivity, thermal
conductivity and reflectivity of any metal. The metal occurs naturally in its
pure, free form (native silver), as an alloy with gold and other metals, and in
minerals such as argentite and chlorargyrite.

48
Cd
Cadmium
112.4144

About the element Cadmium: Cadmium is a chemical element with symbol Cd and
atomic number 48. This soft, bluish-white metal is chemically similar to the two
other stable metals in group 12, zinc and mercury. Like zinc, it prefers
oxidation state +2 in most of its compounds and like mercury it shows a low
melting point compared to transition metals.

49
In
Indium
114.8181

About the element Indium: Indium is a chemical element with symbol In and atomic
number 49. It is a post-transition metallic element that is rare in Earth's
crust. The metal is very soft, malleable and easily fusible, with a melting
point higher than sodium, but lower than lithium or tin.

50
Sn
Tin
118.7107

About the element Tin: Tin is a chemical element with the symbol Sn (for
Latin:stannum) and atomic number 50. It is a main group metal in group 14 of the
periodic table. Tin shows a chemical similarity to both neighboring group-14
elements, germanium and lead, and has two possible oxidation states, +2 and the
slightly more stable +4.

51
Sb
Antimony
121.7601

About the element Antimony: Antimony is a chemical element with symbol Sb (from
Latin:stibium) and atomic number 51. A lustrous gray metalloid, it is found in
nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have
been known since ancient times and were used for cosmetics; metallic antimony
was also known, but it was erroneously identified as lead upon its discovery.

52
Te
Tellurium
127.603

About the element Tellurium: Tellurium is a chemical element with symbol Te and
atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid.
Tellurium is chemically related to selenium and sulfur.

53
I
Iodine
126.904473

About the element Iodine: Iodine is a chemical element with symbol I and atomic
number 53. The name is from Greek ἰοειδής ioeidēs, meaning violet or purple, due
to the color of iodine vapor. Iodine and its compounds are primarily used in
nutrition, and industrially in the production of acetic acid and certain
polymers.

54
Xe
Xenon
131.2936

About the element Xenon: Xenon is a chemical element with symbol Xe and atomic
number 54. It is a colorless, dense, odorless noble gas, that occurs in the
Earth's atmosphere in trace amounts. Although generally unreactive, xenon can
undergo a few chemical reactions such as the formation of xenon
hexafluoroplatinate, the first noble gas compound to be synthesized.

55
Cs
Cesium
132.905451966

About the element Cesium: Caesium or cesium is a chemical element with symbol Cs
and atomic number 55. It is a soft, silvery-gold alkali metal with a melting
point of 28 °C (82 °F), which makes it one of only five elemental metals that
are liquid at or near room temperature. Caesium is an alkali metal and has
physical and chemical properties similar to those of rubidium and potassium.

56
Ba
Barium
137.3277

About the element Barium: Barium is a chemical element with symbol Ba and atomic
number 56. It is the fifth element in Group 2, a soft silvery metallic alkaline
earth metal. Because of its high chemical reactivity barium is never found in
nature as a free element.


72
Hf
Hafnium
178.492

About the element Hafnium: Hafnium is a chemical element with symbol Hf and
atomic number 72. A lustrous, silvery gray, tetravalent transition metal,
hafnium chemically resembles zirconium and is found in zirconium minerals. Its
existence was predicted by Dmitri Mendeleev in 1869, though it was not
identified until 1923, making it the penultimate stable element to be discovered
(rhenium was identified two years later).

73
Ta
Tantalum
180.947882

About the element Tantalum: Tantalum is a chemical element with symbol Ta and
atomic number 73. Previously known as tantalium, its name comes from Tantalus,
an antihero from Greek mythology. Tantalum is a rare, hard, blue-gray, lustrous
transition metal that is highly corrosion-resistant.

74
W
Tungsten
183.841

About the element Tungsten: Tungsten, also known as wolfram, is a chemical
element with symbol W and atomic number 74. The word tungsten comes from the
Swedish language tung sten, which directly translates to heavy stone. Its name
in Swedish is volfram, however, in order to distinguish it from scheelite, which
in Swedish is alternatively named tungsten.

75
Re
Rhenium
186.2071

About the element Rhenium: Rhenium is a chemical element with symbol Re and
atomic number 75. It is a silvery-white, heavy, third-row transition metal in
group 7 of the periodic table. With an estimated average concentration of 1 part
per billion (ppb), rhenium is one of the rarest elements in the Earth's crust.

76
Os
Osmium
190.233

About the element Osmium: Osmium (from Greek osme (ὀσμή) meaning "smell") is a
chemical element with symbol Os and atomic number 76. It is a hard, brittle,
bluish-white transition metal in the platinum group that is found as a trace
element in alloys, mostly in platinum ores. Osmium is the densest naturally
occurring element, with a density of 22.59 g/cm3.

77
Ir
Iridium
192.2173

About the element Iridium: Iridium is a chemical element with symbol Ir and
atomic number 77. A very hard, brittle, silvery-white transition metal of the
platinum group, iridium is generally credited with being the second densest
element (after osmium) based on measured density, although calculations
involving the space lattices of the elements show that iridium is denser. It is
also the most corrosion-resistant metal, even at temperatures as high as 2000
°C. Although only certain molten salts and halogens are corrosive to solid
iridium, finely divided iridium dust is much more reactive and can be flammable.

78
Pt
Platinum
195.0849

About the element Platinum: Platinum is a chemical element with symbol Pt and
atomic number 78. It is a dense, malleable, ductile, highly unreactive,
precious, gray-white transition metal. Its name is derived from the Spanish term
platina, which is literally translated into "little silver".

79
Au
Gold
196.9665695

About the element Gold: Gold is a chemical element with symbol Au (from
Latin:aurum) and atomic number 79. In its purest form, it is a bright, slightly
reddish yellow, dense, soft, malleable and ductile metal. Chemically, gold is a
transition metal and a group 11 element.

80
Hg
Mercury
200.5923

About the element Mercury: Mercury is a chemical element with symbol Hg and
atomic number 80. It is commonly known as quicksilver and was formerly named
hydrargyrum (/haɪˈdrɑːrdʒərəm/). A heavy, silvery d-block element, mercury is
the only metallic element that is liquid at standard conditions for temperature
and pressure; the only other element that is liquid under these conditions is
bromine, though metals such as caesium, gallium, and rubidium melt just above
room temperature.

81
Tl
Thallium
204.38

About the element Thallium: Thallium is a chemical element with symbol Tl and
atomic number 81. This soft gray post-transition metal is not found free in
nature. When isolated, it resembles tin, but discolors when exposed to air.

82
Pb
Lead
207.21

About the element Lead: Lead (/lɛd/) is a chemical element in the carbon group
with symbol Pb (from Latin:plumbum) and atomic number 82. Lead is a soft,
malleable and heavy post-transition metal. Metallic lead has a bluish-white
color after being freshly cut, but it soon tarnishes to a dull grayish color
when exposed to air.

83
Bi
Bismuth
208.980401

About the element Bismuth: Bismuth is a chemical element with symbol Bi and
atomic number 83. Bismuth, a pentavalent post-transition metal, chemically
resembles arsenic and antimony. Elemental bismuth may occur naturally, although
its sulfide and oxide form important commercial ores.

84
Po
Polonium
209

About the element Polonium: Polonium is a chemical element with symbol Po and
atomic number 84, discovered in 1898 by Marie Curie and Pierre Curie. A rare and
highly radioactive element with no stable isotopes, polonium is chemically
similar to bismuth and tellurium, and it occurs in uranium ores. Applications of
polonium are few.

85
At
Astatine
210

About the element Astatine: Astatine is a very rare radioactive chemical element
with the chemical symbol At and atomic number 85. It occurs on Earth as the
decay product of various heavier elements. All its isotopes are short-lived; the
most stable is astatine-210, with a half-life of 8.1 hours.

86
Rn
Radon
222

About the element Radon: Radon is a chemical element with symbol Rn and atomic
number 86. It is a radioactive, colorless, odorless, tasteless noble gas,
occurring naturally as a decay product of radium. Its most stable isotope,
222Rn, has a half-life of 3.8 days.

87
Fr
Francium
223

About the element Francium: Francium is a chemical element with symbol Fr and
atomic number 87. It used to be known as eka-caesium and actinium K. It is the
second-least electronegative element, behind only caesium. Francium is a highly
radioactive metal that decays into astatine, radium, and radon.

88
Ra
Radium
226

About the element Radium: Radium is a chemical element with symbol Ra and atomic
number 88. It is the sixth element in group 2 of the periodic table, also known
as the alkaline earth metals. Pure radium is almost colorless, but it readily
combines with nitrogen (rather than oxygen) on exposure to air, forming a black
surface layer of radium nitride (Ra3N2).


104
Rf
Rutherfordium
267

About the element Rutherfordium: Rutherfordium is a chemical element with symbol
Rf and atomic number 104, named in honor of physicist Ernest Rutherford. It is a
synthetic element (an element that can be created in a laboratory but is not
found in nature) and radioactive; the most stable known isotope, 267Rf, has a
half-life of approximately 1.3 hours. In the periodic table of the elements, it
is a d - block element and the second of the fourth - row transition elements.

105
Db
Dubnium
268

About the element Dubnium: Dubnium is a chemical element with symbol Db and
atomic number 105. It is named after the town of Dubna in Russia (north of
Moscow), where it was first produced. It is a synthetic element (an element that
can be created in a laboratory but is not found in nature) and radioactive; the
most stable known isotope, dubnium-268, has a half-life of approximately 28
hours.

106
Sg
Seaborgium
269

About the element Seaborgium: Seaborgium is a synthetic element with symbol Sg
and atomic number 106. Its most stable isotope 271Sg has a half-life of 1.9
minutes. A more recently discovered isotope 269Sg has a potentially slightly
longer half-life (ca.

107
Bh
Bohrium
270

About the element Bohrium: Bohrium is a chemical element with symbol Bh and
atomic number 107. It is named after Danish physicist Niels Bohr. It is a
synthetic element (an element that can be created in a laboratory but is not
found in nature) and radioactive; the most stable known isotope, 270Bh, has a
half-life of approximately 61 seconds.

108
Hs
Hassium
269

About the element Hassium: Hassium is a chemical element with symbol Hs and
atomic number 108, named after the German state of Hesse. It is a synthetic
element (an element that can be created in a laboratory but is not found in
nature) and radioactive; the most stable known isotope, 269Hs, has a half-life
of approximately 9.7 seconds, although an unconfirmed metastable state, 277mHs,
may have a longer half-life of about 130 seconds. More than 100 atoms of hassium
have been synthesized to date.

109
Mt
Meitnerium
278

About the element Meitnerium: Meitnerium is a chemical element with symbol Mt
and atomic number 109. It is an extremely radioactive synthetic element (an
element not found in nature that can be created in a laboratory). The most
stable known isotope, meitnerium-278, has a half-life of 7.6 seconds.

110
Ds
Darmstadtium
281

About the element Darmstadtium: Darmstadtium is a chemical element with symbol
Ds and atomic number 110. It is an extremely radioactive synthetic element. The
most stable known isotope, darmstadtium-281, has a half-life of approximately 10
seconds.

111
Rg
Roentgenium
282

About the element Roentgenium: Roentgenium is a chemical element with symbol Rg
and atomic number 111. It is an extremely radioactive synthetic element (an
element that can be created in a laboratory but is not found in nature); the
most stable known isotope, roentgenium-282, has a half-life of 2.1 minutes.
Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion
Research near Darmstadt, Germany.

112
Cn
Copernicium
285

About the element Copernicium: Copernicium is a chemical element with symbol Cn
and atomic number 112. It is an extremely radioactive synthetic element that can
only be created in a laboratory. The most stable known isotope, copernicium-285,
has a half-life of approximately 29 seconds, but it is possible that this
copernicium isotope may have a nuclear isomer with a longer half-life, 8.9 min.

113
Nh
Nihonium
286

About the element Nihonium: Nihonium is a chemical element with atomic number
113. It has a symbol Nh. It is a synthetic element (an element that can be
created in a laboratory but is not found in nature) and is extremely
radioactive; its most stable known isotope, nihonium-286, has a half-life of 20
seconds.

114
Fl
Flerovium
289

About the element Flerovium: Flerovium is a superheavy artificial chemical
element with symbol Fl and atomic number 114. It is an extremely radioactive
synthetic element. The element is named after the Flerov Laboratory of Nuclear
Reactions of the Joint Institute for Nuclear Research in Dubna, Russia, where
the element was discovered in 1998.

115
Mc
Moscovium
289

About the element Moscovium: Moscovium is the name of a synthetic superheavy
element in the periodic table that has the symbol Mc and has the atomic number
115. It is an extremely radioactive element; its most stable known isotope,
moscovium-289, has a half-life of only 220 milliseconds. It is also known as
eka-bismuth or simply element 115.

116
Lv
Livermorium
293

About the element Livermorium: Livermorium is a synthetic superheavy element
with symbol Lv and atomic number 116. It is an extremely radioactive element
that has only been created in the laboratory and has not been observed in
nature. The element is named after the Lawrence Livermore National Laboratory in
the United States, which collaborated with the Joint Institute for Nuclear
Research in Dubna, Russia to discover livermorium in 2000.

117
Ts
Tennessine
294

About the element Tennessine: Tennessine is a superheavy artificial chemical
element with an atomic number of 117 and a symbol of Ts. Also known as
eka-astatine or element 117, it is the second-heaviest known element and
penultimate element of the 7th period of the periodic table. As of 2016, fifteen
tennessine atoms have been observed:six when it was first synthesized in 2010,
seven in 2012, and two in 2014.

118
Og
Oganesson
294

About the element Oganesson: Oganesson is IUPAC's name for the transactinide
element with the atomic number 118 and element symbol Og. It is also known as
eka-radon or element 118, and on the periodic table of the elements it is a
p-block element and the last one of the 7th period. Oganesson is currently the
only synthetic member of group 18.


57
La
Lanthanum
138.905477

About the element Lanthanum: Lanthanum is a soft, ductile, silvery-white
metallic chemical element with symbol La and atomic number 57. It tarnishes
rapidly when exposed to air and is soft enough to be cut with a knife. It gave
its name to the lanthanide series, a group of 15 similar elements between
lanthanum and lutetium in the periodic table:it is also sometimes considered the
first element of the 6th-period transition metals.

58
Ce
Cerium
140.1161

About the element Cerium: Cerium is a chemical element with symbol Ce and atomic
number 58. It is a soft, silvery, ductile metal which easily oxidizes in air.
Cerium was named after the dwarf planet Ceres (itself named after the Roman
goddess of agriculture).

59
Pr
Praseodymium
140.907662

About the element Praseodymium: Praseodymium is a chemical element with symbol
Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile
metal in the lanthanide group. It is valued for its magnetic, electrical,
chemical, and optical properties.

60
Nd
Neodymium
144.2423

About the element Neodymium: Neodymium is a chemical element with symbol Nd and
atomic number 60. It is a soft silvery metal that tarnishes in air. Neodymium
was discovered in 1885 by the Austrian chemist Carl Auer von Welsbach.

61
Pm
Promethium
145

About the element Promethium: Promethium, originally prometheum, is a chemical
element with the symbol Pm and atomic number 61. All of its isotopes are
radioactive; it is one of only two such elements that are followed in the
periodic table by elements with stable forms, a distinction shared with
technetium. Chemically, promethium is a lanthanide, which forms salts when
combined with other elements.

62
Sm
Samarium
150.362

About the element Samarium: Samarium is a chemical element with symbol Sm and
atomic number 62. It is a moderately hard silvery metal that readily oxidizes in
air. Being a typical member of the lanthanide series, samarium usually assumes
the oxidation state +3.

63
Eu
Europium
151.9641

About the element Europium: Europium is a chemical element with symbol Eu and
atomic number 63. It was isolated in 1901 and is named after the continent of
Europe. It is a moderately hard, silvery metal which readily oxidizes in air and
water.

64
Gd
Gadolinium
157.253

About the element Gadolinium: Gadolinium is a chemical element with symbol Gd
and atomic number 64. It is a silvery-white, malleable and ductile rare-earth
metal. It is found in nature only in combined (salt) form.

65
Tb
Terbium
158.925352

About the element Terbium: Terbium is a chemical element with symbol Tb and
atomic number 65. It is a silvery-white rare earth metal that is malleable,
ductile and soft enough to be cut with a knife. Terbium is never found in nature
as a free element, but it is contained in many minerals, including cerite,
gadolinite, monazite, xenotime and euxenite.

66
Dy
Dysprosium
162.5001

About the element Dysprosium: Dysprosium is a chemical element with the symbol
Dy and atomic number 66. It is a rare earth element with a metallic silver
luster. Dysprosium is never found in nature as a free element, though it is
found in various minerals, such as xenotime.

67
Ho
Holmium
164.930332

About the element Holmium: Holmium is a chemical element with symbol Ho and
atomic number 67. Part of the lanthanide series, holmium is a rare earth
element. Holmium was discovered by Swedish chemist Per Theodor Cleve.

68
Er
Erbium
167.2593

About the element Erbium: Erbium is a chemical element in the lanthanide series,
with symbol Er and atomic number 68. A silvery-white solid metal when
artificially isolated, natural erbium is always found in chemical combination
with other elements on Earth. As such, it is a rare earth element which is
associated with several other rare elements in the mineral gadolinite from
Ytterby in Sweden, where yttrium, ytterbium, and terbium were discovered.

69
Tm
Thulium
168.934222

About the element Thulium: Thulium is a chemical element with symbol Tm and
atomic number 69. It is the thirteenth and antepenultimate (third-last) element
in the lanthanide series. Like the other lanthanides, the most common oxidation
state is +3, seen in its oxide, halides and other compounds.

70
Yb
Ytterbium
173.0451

About the element Ytterbium: Ytterbium is a chemical element with symbol Yb and
atomic number 70. It is the fourteenth and penultimate element in the lanthanide
series, which is the basis of the relative stability of its +2 oxidation state.
However, like the other lanthanides, its most common oxidation state is +3, seen
in its oxide, halides and other compounds.

71
Lu
Lutetium
174.96681

About the element Lutetium: Lutetium is a chemical element with symbol Lu and
atomic number 71. It is a silvery white metal, which resists corrosion in dry,
but not in moist air. It is considered the first element of the 6th-period
transition metals and the last element in the lanthanide series, and is
traditionally counted among the rare earths.

89
Ac
Actinium
227

About the element Actinium: Actinium is a radioactive chemical element with
symbol Ac (not to be confused with the abbreviation for an acetyl group) and
atomic number 89, which was discovered in 1899. It was the first non-primordial
radioactive element to be isolated. Polonium, radium and radon were observed
before actinium, but they were not isolated until 1902.

90
Th
Thorium
232.03774

About the element Thorium: Thorium is a chemical element with symbol Th and
atomic number 90. A radioactive actinide metal, thorium is one of only two
significantly radioactive elements that still occur naturally in large
quantities as a primordial element (the other being uranium). It was discovered
in 1828 by the Norwegian Reverend and amateur mineralogist Morten Thrane Esmark
and identified by the Swedish chemist Jöns Jakob Berzelius, who named it after
Thor, the Norse god of thunder.

91
Pa
Protactinium
231.035882

About the element Protactinium: Protactinium is a chemical element with symbol
Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts
with oxygen, water vapor and inorganic acids. It forms various chemical
compounds where protactinium is usually present in the oxidation state +5, but
can also assume +4 and even +2 or +3 states.

92
U
Uranium
238.028913

About the element Uranium: Uranium is a chemical element with symbol U and
atomic number 92. It is a silvery-white metal in the actinide series of the
periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are
valence electrons.

93
Np
Neptunium
237

About the element Neptunium: Neptunium is a chemical element with symbol Np and
atomic number 93. A radioactive actinide metal, neptunium is the first
transuranic element. Its position in the periodic table just after uranium,
named after the planet Uranus, led to it being named after Neptune, the next
planet beyond Uranus.

94
Pu
Plutonium
244

About the element Plutonium: Plutonium is a transuranic radioactive chemical
element with symbol Pu and atomic number 94. It is an actinide metal of
silvery-gray appearance that tarnishes when exposed to air, and forms a dull
coating when oxidized. The element normally exhibits six allotropes and four
oxidation states.

95
Am
Americium
243

About the element Americium: Americium is a radioactive transuranic chemical
element with symbol Am and atomic number 95. This member of the actinide series
is located in the periodic table under the lanthanide element europium, and thus
by analogy was named after the Americas. Americium was first produced in 1944 by
the group of Glenn T.Seaborg from Berkeley, California, at the metallurgical
laboratory of University of Chicago.

96
Cm
Curium
247

About the element Curium: Curium is a transuranic radioactive chemical element
with symbol Cm and atomic number 96. This element of the actinide series was
named after Marie and Pierre Curie – both were known for their research on
radioactivity. Curium was first intentionally produced and identified in July
1944 by the group of Glenn T. Seaborg at the University of California, Berkeley.

97
Bk
Berkelium
247

About the element Berkelium: Berkelium is a transuranic radioactive chemical
element with symbol Bk and atomic number 97. It is a member of the actinide and
transuranium element series. It is named after the city of Berkeley, California,
the location of the University of California Radiation Laboratory where it was
discovered in December 1949.

98
Cf
Californium
251

About the element Californium: Californium is a radioactive metallic chemical
element with symbol Cf and atomic number 98. The element was first made in 1950
at the University of California Radiation Laboratory in Berkeley, by bombarding
curium with alpha particles (helium-4 ions). It is an actinide element, the
sixth transuranium element to be synthesized, and has the second-highest atomic
mass of all the elements that have been produced in amounts large enough to see
with the unaided eye (after einsteinium).

99
Es
Einsteinium
252

About the element Einsteinium: Einsteinium is a synthetic element with symbol Es
and atomic number 99. It is the seventh transuranic element, and an actinide.
Einsteinium was discovered as a component of the debris of the first hydrogen
bomb explosion in 1952, and named after Albert Einstein.

100
Fm
Fermium
257

About the element Fermium: Fermium is a synthetic element with symbol Fm and
atomic number 100. It is a member of the actinide series. It is the heaviest
element that can be formed by neutron bombardment of lighter elements, and hence
the last element that can be prepared in macroscopic quantities, although pure
fermium metal has not yet been prepared.

101
Md
Mendelevium
258

About the element Mendelevium: Mendelevium is a synthetic element with chemical
symbol Md (formerly Mv) and atomic number 101. A metallic radioactive
transuranic element in the actinide series, it is the first element that
currently cannot be produced in macroscopic quantities through neutron
bombardment of lighter elements. It is the antepenultimate actinide and the
ninth transuranic element.

102
No
Nobelium
259

About the element Nobelium: Nobelium is a synthetic chemical element with symbol
No and atomic number 102. It is named in honor of Alfred Nobel, the inventor of
dynamite and benefactor of science. A radioactive metal, it is the tenth
transuranic element and is the penultimate member of the actinide series.

103
Lr
Lawrencium
266

About the element Lawrencium: Lawrencium is a synthetic chemical element with
chemical symbol Lr (formerly Lw) and atomic number 103. It is named in honor of
Ernest Lawrence, inventor of the cyclotron, a device that was used to discover
many artificial radioactive elements. A radioactive metal, lawrencium is the
eleventh transuranic element and is also the final member of the actinide
series.


WHAT'S ALL THIS, THEN?

This is a periodic table that is perusable visually, and offers screen readers
the ability to browse the elements and get additional information about each
one.

Why do this? I'm a web developer who is brushing up on the WCAG 2.1 guidelines
for making sites accessible to Internet users with visual impairments. So this
is, um...fun for me. (Seriously, though, it is. ;] )

Are you using Mac OS X? You can browse the list of elements using VoiceOver.

Cheatsheet: turn VoiceOver on and off using Command+F5. This should read the
headers, and then start reading off a hidden list of all the elements. If you
select one of these element links, it will read a brief blurb with additional
information about the element you selected.

To browse the links with VoiceOver's Web Rotor, turn on VoiceOver and hit
Control+Option+U. Then use the up and down arrow keys to quickly browse the list
of elements.

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