Periodic Table of the Elements

1 - H - Hydrogen
Atomic Weight: 1.00794
Oxidation States: 1
Electron Configuration: 1s1

2 - He - Helium
Atomic Weight: 4.00260
Electron Configuration: 1s2

3 - Li - Lithium
Atomic Weight: 6.941
Oxidation States: 1
Electron Configuration: 1s2,2s1

4 - Be - Beryllium
Atomic Weight: 9.01218
Oxidation States: 2
Electron Configuration: 1s2,2s2

5 - B - Boron
Atomic Weight: 10.811
Oxidation States: 3
Electron Configuration: 1s2,2s2,p1

6 - C - Carbon
Atomic Weight: 12.011
Oxidation States: +/-4, 2
Electron Configuration: 1s2,2s2,p2

7 - N - Nitrogen
Atomic Weight: 14.0067
Oxidation States: +/-3, 5,4,2
Electron Configuration: 1s2,2s2,p3

8 - O - Oxygen
Atomic Weight: 15.9994
Oxidation States: -2
Electron Configuration: 1s2,2s2,p4

9 - F - Fluorine
Atomic Weight: 18.99840
Oxidation States: -1
Electron Configuration: 1s2,2s2,p5

10 - Ne - Neon
Atomic Weight:
Oxidation States: --
Electron Configuration: 1s2,2s2,p6

11 - Na - Sodium
Atomic Weight:
Oxidation States: 1
Electron Configuration: [Ne]3s1

12 - Mg - Magnesium
Atomic Weight:
Oxidation States: 2
Electron Configuration: [Ne]3s2

13 - Al - Aluminum
Atomic Weight:
Oxidation States: 3
Electron Configuration: [Ne]3s2,p1

14 - Si - Silicon
Atomic Weight: 28.0855
Oxidation States: 4,2
Electron Configuration: [Ne]3s2,p2

15 - P - Phosphorus
Atomic Weight: 30.97376
Oxidation States: 5, +/-3,4
Electron Configuration: [Ne]3s2,p3

16 - S - Sulfur
Atomic Weight: 32.066
Oxidation States: 6, +/-2,4
Electron Configuration: [Ne]3s2,p4

17 - Cl - Chlorine
Atomic Weight: 35.4527
Oxidation States: +/-1, 3,5,7
Electron Configuration: [Ne]3s2,p5

18 - Ar - Argon
Atomic Weight: 39.948
Oxidation States: --
Electron Configuration: [Ne]3s2,p6

19 - K - Potassium
Atomic Weight: 39.0983
Oxidation States: 1
Electron Configuration: [Ar]4s1

20 - Ca - Calcium
Atomic Weight: 40.078
Oxidation States: 2
Electron Configuration: [Ar]4s2

21 - Sc - Scandium
Atomic Weight: 44.9559
Oxidation States: 3
Electron Configuration: [Ar]3d1,4s2

22 - Ti - Titanium
Atomic Weight: 47.88
Oxidation States: 4, 3
Electron Configuration: [Ar]3d2,4s2

23 - V - Vanadium
Atomic Weight: 50.9415
Oxidation States: 5, 4,3,2
Electron Configuration: [Ar]3d3,4s2

24 - Cr - Chromium
Atomic Weight: 51.996
Oxidation States: 3, 6,2
Electron Configuration: [Ar]3d5,4s1

25 - Mn - Manganese
Atomic Weight: 54.9380
Oxidation States: 4,2, 7,6,3
Electron Configuration: [Ar]3d5,4s2

26 - Fe - Iron
Atomic Weight: 55.847
Oxidation States: 3, 2
Electron Configuration: [Ar]3d6,4s2

27 - Co - Cobalt
Atomic Weight: 58.9332
Oxidation States: 2, 3
Electron Configuration: [Ar]3d7,4s2

28 - Ni - Nickel
Atomic Weight: 58.6934
Oxidation States: 2, 3
Electron Configuration: [Ar]3d8,4s2

29 - Cu - Copper
Atomic Weight: 63.546
Oxidation States: 2, 1
Electron Configuration: [Ar]3d10,4s1

30 - Zn - Zinc
Atomic Weight: 65.39 g/mol
Oxidation States: 2
Electron Configuration: [Ar]3d10,4s2

31 - Ga - Gallium
Atomic Weight: 69.723
Oxidation States: 3
Electron Configuration: [Ar]3d10,4s2,p1

32 - Ge - Germanium
Atomic Weight: 72.61
Oxidation States: 4
Electron Configuration: [Ar]3d10,4s2,p2

33 - As - Arsenic
Atomic Weight: 74.9216
Oxidation States: +/-3, 5
Electron Configuration: [Ar]3d10,4s2,p4

34 - Se - Selenium
Atomic Weight: 78.96 g/mol
Oxidation States: 4, -2,6
Electron Configuration: [Ar]3d10,4s2,p4

35 - Br - Bromine
Atomic Weight: 79.904
Oxidation States: +/-1, 5,7
Electron Configuration: [Ar]3d10,4s2,p5

36 - Kr - Krypton
Atomic Weight: 83.80 g/mol
Oxidation States: 0,2
Electron Configuration: [Ar]3d10,4s2,p8

37 - Rb - Rubidium
Atomic Weight: 85.4678
Oxidation States: 1
Electron Configuration: [Kr]5s1

38 - Sr - Strontium
Atomic Weight: 87.62
Oxidation States: 2
Electron Configuration: [Kr]5s2

39 - Y - Yttrium
Atomic Weight: 88.9059
Oxidation States: 3
Electron Configuration: [Kr]4d1,5s2

40 - Zr - Zirconium
Atomic Weight: 91.224
Oxidation States: 4
Electron Configuration: [Kr]4d2,5s2

41 - Nb - Niobium
Atomic Weight: 92.9064
Oxidation States: 5, 3
Electron Configuration: [Kr]4d4,5s1

42 - Mo - Molybdenum
Atomic Weight: 95.94
Oxidation States: 6, 5,4,3,2
Electron Configuration: [Kr]4d5,5s1

43 - Tc - Technetium
Atomic Weight: 98
Oxidation States: 7
Electron Configuration: [Kr]4d5,5s2

44 - Ru - Ruthenium
Atomic Weight: 101.07
Oxidation States: 4, 2,3,6,8
Electron Configuration: [Kr]4d7,5s1

45 - Rh - Rhodium
Atomic Weight: 102.9055
Oxidation States: 3, 2,4
Electron Configuration: [Kr]4d8,5s1

46 - Pd - Palladium
Atomic Weight: 106.42
Oxidation States: 2,4
Electron Configuration: [Kr]4d10

47 - Ag - Silver
Atomic Weight: 107.868
Oxidation States: 1
Electron Configuration: [Kr]4d10,5s1

48 - Cd - Cadmium
Atomic Weight: 112.41
Oxidation States: 2
Electron Configuration: [Kr]4d10,5s2

49 - In - Indium
Atomic Weight: 114.82
Oxidation States: 3
Electron Configuration: [Kr]4d10,5s2,p1

50 - Sn - Tin
Atomic Weight: 118.710
Oxidation States: 4, 2
Electron Configuration: [Kr]4d10,5s2,p2

51 - Sb - Antimony
Atomic Weight: 121.757
Oxidation States: +/-3, 5
Electron Configuration: [Kr]4d10,5s2,p3

52 - Te - Tellurium
Atomic Weight: 127.60
Oxidation States: 4, -2,6
Electron Configuration: [Kr]4d10,5s2,p4

Synthetic: No

53 - I - Iodine
Atomic Weight: 126.9045
Oxidation States: +/-1, 5,7
Electron Configuration: [Kr]4d10,5s2,p5

54 - Xe - Xenon
Atomic Weight: 131.29
Oxidation States: 0,2,4,6
Electron Configuration: [Kr]4d10,5s2,p6

55 - Cs - Cesium
Atomic Weight: 132.9054
Oxidation States: 1
Electron Configuration: [Xe]6s1

56 - Ba - Barium
Atomic Weight: 137.33
Oxidation States: 2
Electron Configuration: [Xe]6s2

57 - La - Lanthanum
Atomic Weight: 138.9055
Oxidation States: 3
Electron Configuration: [Xe]5d1,6s2

58 - Ce - Cerium
Atomic Weight: 140.12
Oxidation States: 3,4
Electron Configuration: [Xe]4f2,6s2

59 - Pr - Praseodymium
Atomic Weight: 140.9077
Density: 6.77 g/cm³
Electron Configuration: [Xe]4f3,6s2

60 - Nd - Neodymium
Atomic Weight: 144.24
Oxidation States: 3
Electron Configuration: [Xe]4f4,6s2

61 - Pm - Promethium
Atomic Weight: 145
Oxidation States: 3
Electron Configuration: [Xe]4f5,6s2

62 - Sm - Samarium
Atomic Weight: 150.36
Oxidation States: 3, 2
Electron Configuration: [Xe]4f6,6s2

63 - Eu - Europium
Atomic Weight: 151.965
Oxidation States: 3, 2
Electron Configuration: [Xe]4f7,6s2

64 - Gd - Gadolinium
Atomic Weight: 157.25
Oxidation States: 3
Electron Configuration: [Xe]4f7,5d1,6s2

65 - Tb - Terbium
Atomic Weight: 158.9253
Oxidation States: 3, 4
Electron Configuration: [Xe]4f9,6s2

66 - Dy - Dysprosium
Atomic Weight: 162.50
Oxidation States: 3
Electron Configuration: [Xe]4f10,6s2

67 - Ho - Holmium
Atomic Weight: 164.9303
Oxidation States: 3
Electron Configuration: [Xe]4f11,6s2

68 - Er - Erbium
Atomic Weight: 167.26
Oxidation States: 3
Electron Configuration: [Xe]4f12,6s2

69 - Tm - Thulium
Atomic Weight: 168.9342
Oxidation States: 3, 2
Electron Configuration: [Xe]4f13,6s2

70 - Yb - Ytterbium
Atomic Weight: 173.04
Oxidation States: 3, 2
Electron Configuration: [Xe]4f14,6s2

71 - Lu - Lutetium
Atomic Weight: 174.967
Oxidation States: 3
Electron Configuration: [Xe]4f14,5d1,6s2

72 - Hf - Hafnium
Atomic Weight: 178.49
Oxidation States: 4
Electron Configuration: [Xe]4f14,5d2,6s2

73 - Ta - Tantalum
Atomic Weight: 180.9479
Oxidation States: 5

74 - W - Tungsten
Atomic Weight: 183.85
Oxidation States: 6, 5,4,3,2
Electron Configuration: [Xe]4f14,5d4,6s2

75 - Re - Rhenium
Atomic Weight: 186.207
Oxidation States: 7,4, 6,2,-1
Electron Configuration: [Xe]4f14,5d5,6s2

76 - Os - Osmium
Atomic Weight: 190.2
Oxidation States: 4, 2,3,6,8
Synthetic: No

77 - Ir - Iridium
Atomic Weight: 192.22
Oxidation States: 4, 2,3,6
Electron Configuration: [Xe]4f14,5d7,6s2

78 - Pt - Platinum
Atomic Weight: 195.08
Oxidation States: 4, 2
Electron Configuration: [Xe]4f14,5d6,6s1

79 - Au - Gold
Atomic Weight: 196.9665
Oxidation States: 3, 1
Electron Configuration: [Xe]4f14,5d10,6s1

80 - Hg - Mercury
Atomic Weight: 200.59
Oxidation States: 2, 1
Electron Configuration: [Xe]4f14,5d10,6s2

81 - Tl - Thallium
Atomic Weight: 204.383
Oxidation States: 1, 3
Electron Configuration: [Xe]4f14,5d10,6s2,p1

82 - Pb - Lead
Atomic Weight: 207.2
Oxidation States: 2, 4
Electron Configuration: [Xe]4f14,5d10,6s2,p2

83 - Bi - Bismuth
Atomic Weight: 208.9804
Oxidation States: 3, 5
Electron Configuration: [Xe]4f14,5d10,6s2,p3

84 - Po - Polonium
Atomic Weight: 209
Oxidation States: 4, 2,6
Electron Configuration: [Xe]4f14,5d10,6s2,p4

85 - At - Astatine
Atomic Weight: 210
Oxidation States: +/-1, 3,5,7
Electron Configuration: [Xe]4f14,5d10,6s2,p5

86 - Rn - Radon
Atomic Weight: 222
Oxidation States: 0,2
Electron Configuration: [Xe]4f14,5d10,6s2,p6

87 - Fr - Francium
Atomic Weight: 223
Oxidation States: 1
Electron Configuration: [Rn]7s1

88 - Ra - Radium
Atomic Weight: 226.0254
Oxidation States: 2
Electron Configuration: [Rn]7s2

89 - Ac - Actinium
Atomic Weight: 227
Oxidation States: 3
Electron Configuration: [Rn]6d1,7s2

90 - Th - Thorium
Atomic Weight: 232.0381
Oxidation States: 4
Electron Configuration: [Rn]6d2,7s2

91 - Pa - Proctactinium
Atomic Weight: 231.0359
Oxidation States: 5, 4
Electron Configuration: [Rn]5f2,6d1,7s2

92 - U - Uranium
Atomic Weight: 238.029
Oxidation States: 6, 5,4,3
Electron Configuration: [Rn]5f3,6d1,7s2

93 - Np - Neptunium
Atomic Weight: 237.0482
Oxidation States: 5, 6,4,3
Electron Configuration: [Rn]5f4,6d1,7s2

94 - Pu - Plutonium
Atomic Weight: 244
Oxidation States: 4, 6,5,3
Electron Configuration: [Rn]5f6,7s2

95 - Am - Americium
Atomic Weight: 243
Oxidation States: 3, 6,5,4
Electron Configuration: [Rn]5f7,7s2

96 - Cm - Curium
Atomic Weight: 247
Oxidation States: 3
Electron Configuration: [Rn]5f7,6d1,7s2

97 - Bk - Berkelium
Atomic Weight: 247
Oxidation States: 3, 4
Electron Configuration: [Rn]5f8,6d1,7s2

98 - Cf - Californium
Atomic Weight: 251
Oxidation States: --
Electron Configuration: [Rn]5f10,7s2

99 - Es - Einsteinium
Atomic Weight: 252
Oxidation States: 3
Electron Configuration: [Rn]5f11,7s2

100 - Fm - Fermium
Atomic Weight: 257
Oxidation States: 3
Electron Configuration: [Rn]5f11,7s2

101 - Md - Mendelevium
Atomic Weight: 258
Oxidation States: 3
Electron Configuration: [Rn]5f13,7s2

102 - No - Nobelium
Atomic Weight: 259
Oxidation States: 3, 2
Electron Configuration: [Rn]5f14,7s2

103 - Lr - Lawrencium
Atomic Weight: 260
Oxidation States: 3
Electron Configuration: [Rn]5f14,6d1,7s2

104 - Db - Dubnium
Atomic Weight: 261
Oxidation States: --
Electron Configuration: [Rn]5f14,6d2,7s2

105 - Jl - Joliotium
Atomic Weight: 262
Oxidation States: --
Electron Configuration: [Rn]5f14,6d3,7s2

106 - Rf - Rutherfordium
Atomic Weight: 263
Oxidation States: --
Electron Configuration: [Rn]5f14,6d4,7s2

107 - Bh - Bohrium
Atomic Weight: 262
Oxidation States: --
Electron Configuration: [Rn]5f14,6d5,7s2

108 - Hn - Hahnium
Atomic Weight: 265
Oxidation States: --
Electron Configuration: [Rn]5f14,6d6,7s2

109 - Mt - Meitnerium
Atomic Weight: 266
Oxidation States: --
Electron Configuration: [Rn]5f14,6d7,7s2

The Australian Institute of Energy (AIE) provides data and information on this website as a service to its members and the general public.

While care has been exercised in the collection, compilation and presentation of data, neither the AIE nor its Member Branches can be held responsible for any damage or inconvenience caused by errors, omissions or outdated data.

Please contact the Institute by email at to report any broken links or errors in data.