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Atomic Weight

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Element

Rounded

( for regular calculations )

Standard

( for precise calculations )

Aluminum

26.98

 26.9815386 ± 0.0000008 

Antimony

121.8

    121.760 ± 0.001     

Argon

39.95

     39.948 ± 0.001     

Arsenic

74.92

   74.92160 ± 0.00002   

Barium

137.3

    137.327 ± 0.007     

Beryllium

9.012

   9.012182 ± 0.000003  

Bismuth

209.0

  208.98040 ± 0.00001   

Boron

10.81

10.806 to 10.821

Bromine

79.90

     79.904 ± 0.001     

Cadmium

112.4

    112.411 ± 0.008     

Calcium

40.08

     40.078 ± 0.004     

Carbon

12.011

12.0096 to 12.0116

Cerium

140.1

    140.116 ± 0.001     

Cesium

132.9

132.9054519 ± 0.0000002 

Chlorine

35.45

35.446 to 35.457

Chromium

52.00

    51.9961 ± 0.0006    

Cobalt

58.93

  58.933195 ± 0.000005  

Copper

63.55

     63.546 ± 0.003     

Dysprosium

162.5

    162.500 ± 0.001     

Erbium

167.3

    167.259 ± 0.003     

Europium

152.0

    151.964 ± 0.001     

Fluorine

19.00

 18.9984032 ± 0.0000005 

Gadolinium

157.3

     157.25 ± 0.03      

Gallium

69.72

     69.723 ± 0.001     

Germanium

72.63

      72.63 ± 0.01      

Gold

197.0

 196.966569 ± 0.000004  

Hafnium

178.5

     178.49 ± 0.02      

Helium

4.003

   4.002602 ± 0.000002  

Holmium

164.9

  164.93032 ± 0.00002   

Hydrogen

1.008

1.00784 to 1.00811

Indium

114.8

    114.818 ± 0.003     

Iodine

126.9

  126.90447 ± 0.00003   

Iridium

192.2

    192.217 ± 0.003     

Iron

55.85

     55.845 ± 0.002     

Krypton

83.80

     83.798 ± 0.002     

Lanthanum

138.9

  138.90547 ± 0.00007   

Lead

207.2

      207.2 ± 0.1       

Lithium

6.94

6.938 to 6.997

Lutetium

175.0

   174.9668 ± 0.0001    

Magnesium

24.31

    24.3050 ± 0.0006    

Manganese

54.94

  54.938045 ± 0.000005  

Mercury

200.6

     200.59 ± 0.02      

Molybdenum

95.96 ± 0.02

      95.96 ± 0.02      

Neodymium

144.2

    144.242 ± 0.003     

Neon

20.18

    20.1797 ± 0.0006    

Nickel

58.69

    58.6934 ± 0.0004    

Niobium

92.91

   92.90638 ± 0.00002   

Nitrogen

14.007

14.00643 to 14.00728

Osmium

190.2

     190.23 ± 0.03      

Oxygen

15.999

15.99903 to 15.99977

Palladium

106.4

     106.42 ± 0.01      

Phosphorus

30.97

  30.973762 ± 0.000002  

Platinum

195.1

    195.084 ± 0.009     

Potassium

39.10

    39.0983 ± 0.0001    

Praseodymium

140.9

  140.90765 ± 0.00002   

Protactinium

231.0

  231.03588 ± 0.00002   

Rhenium

186.2

    186.207 ± 0.001     

Rhodium

102.9

  102.90550 ± 0.00002   

Rubidium

85.47

    85.4678 ± 0.0003    

Ruthenium

101.1

     101.07 ± 0.02      

Samarium

150.4

     150.36 ± 0.02      

Scandium

44.96

  44.955912 ± 0.000006  

Selenium

78.96 ± 0.03

      78.96 ± 0.03      

Silicon

28.085

28.084 to 28.086

Silver

107.9

   107.8682 ± 0.0002    

Sodium

22.99

22.98976928 ± 0.00000002

Strontium

87.62

      87.62 ± 0.01      

Sulfur

32.06

32.059 to 32.076

Tantalum

180.9

  180.94788 ± 0.00002   

Tellurium

127.6

     127.60 ± 0.03      

Terbium

158.9

  158.92535 ± 0.00002   

Thallium

204.38

204.382 to 204.385

Thorium

232.0

  232.03806 ± 0.00002   

Thulium

168.9

  168.93421 ± 0.00002   

Tin

118.7

    118.710 ± 0.007     

Titanium

47.87

     47.867 ± 0.001     

Tungsten

183.8

     183.84 ± 0.01      

Uranium

238.0

  238.02891 ± 0.00003   

Vanadium

50.94

    50.9415 ± 0.0001    

Xenon

131.3

    131.293 ± 0.006     

Ytterbium

173.1

    173.054 ± 0.005     

Yttrium

88.91

   88.90585 ± 0.00002   

Zinc

65.38 ± 0.02

      65.38 ± 0.02      

Zirconium

91.22

     91.224 ± 0.002     

Reference    (Click the button next to a value above to see complete citation information for that entry)

Wieser, Michael E., and Tyler B. Coplen. "Atomic weights of the elements 2009 (IUPAC Technical Report)." Pure and Applied Chemistry, volume 83, number 2, 2011, pp. 359–396. doi:10.1351/PAC-REP-10-09-14