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Pure Appl. Chem., Vol. 70, No. 1, pp. 237-257, 1998.


History of the recommended atomic-weight values*

Calcium 

Z
E
Year
Ar(E)
U[Ar(E)]
D[Ar(E)]
D[Ar(E)]
U[Ar(E)]
20 Ca 1882 40.08 0.1 0.002 0.02
1894 40 3 -0.078 -0.026
1896 40.08 0.03 0.002 0.067
1897 40.07 0.03 -0.008 -0.27
1900 40.1 0.3 0.022 0.073
1909 40.09 0.03 0.012 0.4
1912 40.07 0.03 -0.008 -0.27
1931 40.08 0.03 0.002 0.067
1969 40.08 0.01 0.002 0.2
1983 40.078 0.004

> Return to list or table of elements

Ref. History of the recommended atomic-weight values from 1882 to 1997: a comparison of differences from current values to the estimated uncertainties of earlier values, Pure Appl. Chem., Vol. 70, No. 1, pp. 237-257, 1998.

Page last modified 7 June 2000
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