News & Notices

Organizations & People

Standing Committees

Divisions

Projects

Reports
..By Year
..By Division
..Other Committees
..Provisionals

Publications

Symposia

AMP

Links of Interest

Search the Site

Home Page

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

History of the recommended atomic-weight values*

Potassium (Kalium)

Z	E	Year	Ar(E)	U[Ar(E)]	D[Ar(E)]	D[Ar(E)] U[Ar(E)]
19	K	1882	39.11	0.1	0.012	0.12
		1903	39.15	0.03	0.052	1.7
		1909	39.1	0.03	0.0017	0.057
		1925	39.096	0.003	-0.0023	-0.77
		1929	39.1	0.03	0.0017	0.057
		1934	39.096	0.003	-0.0023	-0.77
		1951	39.1	0.03	0.0017	0.057
		1961	39.102	0.003	0.0037	1.2
		1969	39.102	0.003	0.0037	1.2
		1971	39.098	0.003	-0.0003	-0.1
		1975	39.0983	0.0003	0	0
		1979	39.0983	0.0001

> 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
Copyright © 1997-2000 International Union of Pure and Applied Chemistry.

Questions or comments about IUPAC, please contact the Secretariat.
Questions regarding the website, please contact [email protected].