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


History of the recommended atomic-weight values*

Erbium

Z
E
Year
Ar(E)
U[Ar(E)]
D[Ar(E)]
D[Ar(E)]

U[Ar(E)]
68 Er 1882 166.27 0.1 -0.99 -9.9
1894 166.3 0.3 -0.96 -3.2
1897 166.32 0.03 -0.94 -31
1900 166 0.3 -1.3 -4.2
1909 167.4 0.3 0.14 0.47
1912 167.7 0.3 0.44 1.5
1931 167.64 0.03 0.38 13
1934 165.2 0.03 -2.1 -69
1935 167.84 0.03 0.58 19
1938 167.2 0.3 -0.06 -0.2
1955 167.22 0.03 -0.04 -1.3
1961 167.26 0.03 0 0
1969 167.26 0.03

> 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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