with Relative Atomic Masses

Developers and Contributors:

J. S. Coursey, D. J. Schwab, and R. A. Dragoset

NIST, Physics Laboratory, Office of Electronic Commerce in Scientific and Engineering Data

The atomic weights are available for elements 1 through 112, 114, & 116 and isotopic compositions or abundances are given when appropriate. The atomic weights data were published by T.B. Coplen¹ in Atomic Weights of the Elements 1999, (and include changes reported from the 2001 review in Chem. Int., 23, 179 (2001)) and the isotopic compositions data were published by K.J.R. Rosman² and P.D.P. Taylor³ in Isotopic Compositions of the Elements 1997. The relative atomic masses of the isotopes data were published by G. Audi⁴ and A. H. Wapstra⁵ in The 1995 Update To The Atomic Mass Evaluation.

This data has been compiled from the above sources for the user's convenience and does not represent a critical evaluation by the NIST Physics Laboratory.

1 T.B. Coplen : U.S. Geological Survey, Reston, Virginia, USA
2 K. J. R. Rosman : Department of Applied Physics, Curtin University of Technology, Australia
3 P. D. P. Taylor : Institute for Reference Materials and Measurements, European Commission, Belgium
4 G. Audi : Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Orsay Campus, France
5 A. H. Wapstra : National Institute of Nuclear Physics and High-Energy Physics, Amsterdam, The Netherlands