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

History of the recommended atomic-weight values*

Lanthanum

Z	E	Year	A_r(E)	U[A_r(E)]	D[A_r(E)]	D[A_r(E)] U[A_r(E)]
57	La	1882	138.84	0.1	-0.066	-0.66
		1894	138.2	0.3	-0.71	-2.4
		1896	138.6	0.3	-0.31	-1
		1897	138.64	0.03	-0.27	-8.8
		1900	138.6	0.3	-0.31	-1
		1903	138.9	0.3	-0.0055	-0.018
		1909	139	0.3	0.094	0.32
		1925	138.9	0.03	-0.0055	-0.18
		1933	138.92	0.03	0.014	0.48
		1961	138.91	0.03	0.0045	0.15
		1969	138.9055	0.0003	0	0
		1985	138.9055	0.0002

> 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.

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