Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Atomic Weights and Isotopic Compositions



J S. Coursey, Robert A. Dragoset, D J. Schwab


The atomic weights are available for elements 1 through 111, and isotopic compositions or abundances are given when appropriate. The atomic weights data were published by T. B. Coplen in Atomic Weights of the Elements 1995, J. Phys. Chem. Ref. Data, 26 (5), 1239 (1997) and the isotopic compositions data were published by K. J. R. Rosman and P. D. P. Taylor in Isotopic Compositions of the Elements 1997, J. Phys. Chem. Ref. Data, 27 (6), 1275 (1998). One should note that the isotopic compositions data are not based on Atomic Weights of the Elements 1995 but on another report that is soon to be published, Atomic Weights of the Elements 1997.
Electronic Publication


atomic weight, elements, isotopic abundance, isotopic composition


Coursey, J. , Dragoset, R. and Schwab, D. (1999), Atomic Weights and Isotopic Compositions, Electronic Publication, [online], internal:/None (Accessed June 24, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created September 1, 1999, Updated February 17, 2017