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

History of the recommended atomic-weight values*

Arsenic

Z	E	Year	Ar(E)	U[Ar(E)]	D[Ar(E)]	D[Ar(E)] U[Ar(E)]
33	As	1882	75.09	0.1	0.17	1.7
		1894	75.0	0.3	0.078	0.26
		1896	75.09	0.03	0.17	5.6
		1897	75.01	0.03	0.088	2.9
		1900	75.0	0.3	0.078	0.26
		1910	74.96	0.03	0.038	1.3
		1931	74.93	0.03	0.0084	0.28
		1934	74.91	0.03	-0.012	-0.39
		1961	74.9216	0.0003	0	0
		1969	74.9216	0.0001	0	0
		1985	74.92159	0.00002	-0.00001	-0.5
		1995	74.92160	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.