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


History of the recommended atomic-weight values*

Sodium (Natrium)

Z
E
Year
Ar(E)
U[Ar(E)]
D[Ar(E)]
D[Ar(E)]
U[Ar(E)]
11 Na 1882 23.05 0.1 0.060 0.60
1909 23.00 0.03 0.010 0.34
1925 22.997 0.003 0.0072 2.4
1953 22.984 0.003 -0.0058 -1.9
1961 22.9898 0.0003 0.00003 0.1
1969 22.9898 0.0001 0.00003 0.3
1971 22.98977 0.00001 0 0
1985 22.989768 0.000006 -0.000002 -0.33
1995 22.989770 0.000002

> 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 14 June 2000
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