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Atomic Weight

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Element

Rounded

( for regular calculations )

Standard

( for precise calculations )

Aluminum

26.982

  26.9815384 ± 0.0000003  

Antimony

121.76

     121.760 ± 0.001      

Argon

39.95

39.792 to 39.963

Arsenic

74.922

   74.921595 ± 0.000006   

Barium

137.33

     137.327 ± 0.007      

Beryllium

9.0122

   9.0121831 ± 0.0000005  

Bismuth

208.98

   208.98040 ± 0.00001    

Boron

10.81

10.806 to 10.821

Bromine

79.904

79.901 to 79.907

Cadmium

112.41

     112.414 ± 0.004      

Calcium

40.078

      40.078 ± 0.004      

Carbon

12.011

12.0096 to 12.0116

Cerium

140.12

     140.116 ± 0.001      

Cesium

132.91

132.90545196 ± 0.00000006 

Chlorine

35.45

35.446 to 35.457

Chromium

51.996

     51.9961 ± 0.0006     

Cobalt

58.933

   58.933194 ± 0.000003   

Copper

63.546

      63.546 ± 0.003      

Dysprosium

162.50

     162.500 ± 0.001      

Erbium

167.26

     167.259 ± 0.003      

Europium

151.96

     151.964 ± 0.001      

Fluorine

18.998

18.998403162 ± 0.000000005

Gadolinium

157.25

      157.25 ± 0.03       

Gallium

69.723

      69.723 ± 0.001      

Germanium

72.630

      72.630 ± 0.008      

Gold

196.97

  196.966570 ± 0.000004   

Hafnium

178.49

     178.486 ± 0.006      

Helium

4.0026

    4.002602 ± 0.000002   

Holmium

164.93

  164.930329 ± 0.000005   

Hydrogen

1.0080

1.00784 to 1.00811

Indium

114.82

     114.818 ± 0.001      

Iodine

126.90

   126.90447 ± 0.00003    

Iridium

192.22

     192.217 ± 0.002      

Iron

55.845

      55.845 ± 0.002      

Krypton

83.798

      83.798 ± 0.002      

Lanthanum

138.91

   138.90547 ± 0.00007    

Lead

207.2

206.14 to 207.94

Lithium

6.94

6.938 to 6.997

Lutetium

174.97

    174.9668 ± 0.0001     

Magnesium

24.305

24.304 to 24.307

Manganese

54.938

   54.938043 ± 0.000002   

Mercury

200.59

     200.592 ± 0.003      

Molybdenum

95.95

       95.95 ± 0.01       

Neodymium

144.24

     144.242 ± 0.003      

Neon

20.180

     20.1797 ± 0.0006     

Nickel

58.693

     58.6934 ± 0.0004     

Niobium

92.906

    92.90637 ± 0.00001    

Nitrogen

14.007

14.00643 to 14.00728

Osmium

190.23

      190.23 ± 0.03       

Oxygen

15.999

15.99903 to 15.99977

Palladium

106.42

      106.42 ± 0.01       

Phosphorus

30.974

30.973761998 ± 0.000000005

Platinum

195.08

     195.084 ± 0.009      

Potassium

39.098

     39.0983 ± 0.0001     

Praseodymium

140.91

   140.90766 ± 0.00001    

Protactinium

231.04

   231.03588 ± 0.00001    

Rhenium

186.21

     186.207 ± 0.001      

Rhodium

102.91

   102.90549 ± 0.00002    

Rubidium

85.468

     85.4678 ± 0.0003     

Ruthenium

101.07

      101.07 ± 0.02       

Samarium

150.36

      150.36 ± 0.02       

Scandium

44.956

   44.955907 ± 0.000004   

Selenium

78.971

      78.971 ± 0.008      

Silicon

28.085

28.084 to 28.086

Silver

107.87

    107.8682 ± 0.0002     

Sodium

22.990

 22.98976928 ± 0.00000002 

Strontium

87.62

       87.62 ± 0.01       

Sulfur

32.06

32.059 to 32.076

Tantalum

180.95

   180.94788 ± 0.00002    

Tellurium

127.60

      127.60 ± 0.03       

Terbium

158.93

  158.925354 ± 0.000007   

Thallium

204.38

204.382 to 204.385

Thorium

232.04

    232.0377 ± 0.0004     

Thulium

168.93

  168.934219 ± 0.000005   

Tin

118.71

     118.710 ± 0.007      

Titanium

47.867

      47.867 ± 0.001      

Tungsten

183.84

      183.84 ± 0.01       

Uranium

238.03

   238.02891 ± 0.00003    

Vanadium

50.942

     50.9415 ± 0.0001     

Xenon

131.29

     131.293 ± 0.006      

Ytterbium

173.05

     173.045 ± 0.010      

Yttrium

88.906

   88.905838 ± 0.000002   

Zinc

65.38

       65.38 ± 0.02       

Zirconium

91.224

      91.224 ± 0.002      

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

Prohaska, Thomas, Johanna Irrgeher, Jacqueline Benefield, John K. Böhlke, Lesley A. Chesson, Tyler B. Coplen, Tiping Ding, Philip J. H. Dunn, Manfred Gröning, Norman E. Holden, Harro A. J. Meijer, Heiko Moossen, Antonio Possolo, Yoshio Takahashi, Jochen Vogl, Thomas Walczyk, Jun Wang, Michael E. Wieser, Shigekazu Yoneda, Xiang-Kun Zhu, and Juris Meija. "Standard Atomic Weights of the Elements 2021 (IUPAC Technical Report)." Pure and Applied Chemistry, volume 94, number 5, 2022, pp. 573–600. doi:10.1515/pac-2019-0603

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

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