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


History of the recommended atomic-weight values*

Thulium

Z
E
Year
Ar(E)
U[Ar(E)]
D[Ar(E)]
D[Ar(E)]
U[Ar(E)]
69 Tm 1894 170.7 0.3 1.7 5.9
1903 171 3 2.1 0.69
1909 168.5 0.3 -0.43 -1.4
1922 169.9 0.3 0.97 3.2
1925 169.4 0.3 0.47 1.6
1953 168.89 0.03 -0.044 -1.4
1961 168.934 0.003 -0.00021 -0.07
1969 168.9342 0.0001 -0.00001 -0.1
1985 168.93421 0.00003 0 0
1995 168.93421 0.00002

> 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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