IUPAC Periodic Table of the Isotopes

1

2H

[1.007 84; 1.008 11]

hydrogen

1

7

6Li

[6.938; 6.997]

lithium

39Be

9.012 182(3)

beryllium

4

11

10B

[10.806; 10.821]

boron

5

12

13C

[12.0096; 12.0116]

carbon

6

14

15N

[14.006 43; 14.007 28]

nitrogen

7

16

1817O

[15.999 03; 15.999 77]

oxygen

819F

18.998 4032(5)

fluorine

9

20

2221Ne

20.1797(6)

neon

10

23Na

22.989 769 28(2)

sodium

11

24

2625

Mg

24.3050(6)

magnesium

1227

Al26.981 5386(8)

aluminium(aluminum)

1328

2930Si

[28.084; 28.086]

silicon

1431P

30.973 762(2)

phosphorus

15

32

3433 36

S

[32.059; 32.076]

sulfur

16

35

37Cl

[35.446; 35.457]

chlorine

17

40

36 38Ar

39.948(1)

argon

18

39

4140K

39.0983(1)

potassium

19

40

4442 48

4346Ca

40.078(4)

calcium

2045Sc

44.955 912(6)

scandium

21

48

46 47 4950Ti

47.867(1)

titanium

22

51

50V

50.9415(1)

vanadium

23

52

53 5054Cr

51.9961(6)

chromium

2455Mn

54.938 045(5)

manganese

25

56

5457

58Fe

55.845(2)

iron

2659Co

58.933 195(5)

cobalt

27

58

6062

6164Ni

58.6934(4)

nickel

28

63

65Cu

63.546(3)

copper

29

6466

68 6770Zn

65.38(2)

zinc

30

69

71Ga

69.723(1)

gallium

31

7472

70 7673Ge

72.63(1)

germanium

3275As

74.921 60(2)

arsenic

33

80

78

7682 77

74Se

78.96(3)

selenium

34

79

81Br

79.904(1)

bromine

35

8486

8283

8078Kr

83.798(2)

krypton

36

85

87Rb

85.4678(3)

rubidium

37

88

86 8784Sr

87.62(1)

strontium

3889Y

88.905 85(2)

yttrium

39

90

94

92 9196Zr

91.224(2)

zirconium

4093Nb

92.906 38(2)

niobium

4198

9695

92

100

97 94Mo

95.96(2)

molybdenum

42Tctechnetium

43

102104

101

99100 9698Ru

101.07(2)

ruthenium

44103Rh

102.905 50(2)

rhodium

45106

108105

110104

102Pd

106.42(1)

palladium

46

107

109Ag

107.8682(2)

silver

47114

112111

110

113 116106 108

Cd

112.411(8)

cadmium

48

115

113In

114.818(3)

indium

49120

118116

119

117124

122112 114

115Sn

118.710(7)

tin

50

121

123Sb

121.760(1)

antimony

51130

128

126

125124

122 123120Te

127.60(3)

tellurium

52127I

126.904 47(3)

iodine

53132

129

131

134136130 128

124126Xe

131.293(6)

xenon

54

133

Cs132.905 4519(2)

caesium(cesium)

55138

137136

135

134130

132Ba

137.327(7)

barium

56

139

138La

138.905 47(7)

lanthanum

57

140

142

138136Ce

140.116(1)

cerium

58141Pr

140.907 65(2)

praseodymium

59142

144146

143

145148 150Nd

144.242(3)

neodymium

60Pmpromethium

61152

154147

149

148150

144Sm

150.36(2)

samarium

62

153

151Eu

151.964(1)

europium

63158

160156

157

155154 152Gd

157.25(3)

gadolinium

64159Tb

158.925 35(2)

terbium

65164

162

163

161160

158 156Dy

162.500(1)

dysprosium

66165Ho

164.930 32(2)

holmium

67166

168

167

170

164162Er

167.259(3)

erbium

68169Tm

168.934 21(2)

thulium

69174

172173

171

176170

168Yb

173.054(5)

ytterbium

70

175

176Lu

174.9668(1)

lutetium

71

180

178

177

179176

174Hf

178.49(2)

hafnium

72

181

180Ta

180.947 88(2)

tantalum

73184

186

182

183

180W

183.84(1)

tungsten

74

187

185Re

186.207(1)

rhenium

75 192

190

189

188187

186 184Os

190.23(3)

osmium

76

193

191Ir

192.217(3)

iridium

77 195

194

196198

192 190Pt

195.084(9)

platinum

78

197Au

196.966 569(4)

gold

79202

200199

201

198 204196Hg

200.59(2)

mercury

80

205

203Tl

[204.382; 204.385]

thallium

81

208

206

207 204Pblead

82209Bi

208.980 40(1)

bismuth

83Popolonium

84Atastatine

85Rnradon

86

Frfrancium

87Raradium

88

lanthanoids

57 - 71

actinoids

89 - 103

Acactinium

89232Th

232.038 06(2)

thorium

90231Pa

231.035 88(2)

protactinium

91

238

235234U

238.028 91(3)

uranium

92Npneptunium

93Puplutonium

94Amamericium

95Cmcurium

96Bkberkelium

97Cfcalifornium

98Eseinsteinium

99Fmfermium

100Mdmendelevium

101Nonobelium

102Lrlawrencium

103

Rfrutherfordium

104Dbdubnium

105Sgseaborgium

106Bhbohrium

107Hshassium

108Mtmeitnerium

109Dsdarmstadtium

110Rgroentgenium

111Cncopernicium

112Uutununtrium

113Flflerovium

114Uupununpentium

115Lvlivermorium

116Uusununseptium

117Uuoununoctium

118

June 20, 2012 www.ciaaw.org

Element Background Color Key[Standard atomic weights are determined using all stable isotopes and selected radioactive isotopes (having relatively long half-lives and characteristic isotopic abundances) in natural terrestrial substances. Isotopes are considered stable (non-radioactive) if evidence for radioactive decay has not been detected experimentally.]

1 18

2 13 14 15 16 17

3 4 5 6 7 8 9 10 11 12

4

3He

4.002 602(2)

helium

2

114

112111

110

113 116106 108

Cd

112.411(8)

cadmium

48

{

uncertainty in last digit (112.411 ± 0.008)

element name

element symbol

atomic number(number of protons)

standard atomic weight

isotope mass number(number of protons +neutrons)

113 116 , black indicates isotope is stable

isotopic abundance(mole fraction

, red indicates isotope is radioactive

of isotope)

International Union of Pure and Applied Chemistry (IUPAC) Project 2007-038-3-200, "Development of an isotopic periodic table for the educational community"

Element has two or more isotopes that are used to determine its standard atomic weight. The isotopic abundances and atomic weights vary in natural terrestrial substances. These variations are well known, and the standard atomic weight is given as lower and upper bounds within square brackets, [ ].

Element has two or more isotopes that are used to determine its standard atomic weight. The isotopic abundances and atomic weights vary in natural terrestrial substances, but upper and lower bounds of the standard atomic weight have not been assigned by IUPAC or the variations may be too small to affect the standard atomic weight value. Thus, the standard atomic weight is given as a single value with an uncertainty that includes both measurement uncertainty and uncertainty due to isotopic abundance variations.

Element has only one isotope that is used to determine its standard atomic weight. Thus, the standard atomic weight is invariant and is given as a single value with an IUPAC evaluated measurement uncertainty.

Element has no standard atomic weight because all of its isotopes are radioactive and, in natural terrestrial substances, no isotope occurs with a characteristic isotopic abundance from which a standard atomic weight can be determined.

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