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

History of the recommended atomic-weight values*

Praseodymium

Z	E	Year	A_r(E)	U[A_r(E)]	D[A_r(E)]	D[A_r(E)] U[A_r(E)]
59	Pr	1894	143.5	0.3	2.6	8.6
		1897	143.6	0.03	2.7	90
		1900	140.5	0.3	-0.41	-1.4
		1909	140.6	0.3	-0.31	-1
		1916	140.9	0.3	-0.0076	-0.026
		1925	140.92	0.03	0.012	0.41
		1961	140.907	0.003	-0.00065	-0.22
		1969	140.9077	0.0001	0.00005	0.5
		1985	140.90765	0.00003	0	0
		1995	140.90765	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.

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