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with Relative Atomic Masses

Developers and Contributors:

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

NIST Physical Measurement Laboratory

The atomic weights are available for elements 1 through 118 and isotopic compositions or abundances are given when appropriate. The atomic weights data were published by M.E. Weiser¹ and M. Berglund² in Atomic Weights of the Elements 2007, and the isotopic compositions data were published by J.K. Böhlke³, J.R. de Laeter⁴, P. De Bièvre⁵, H. Hidaka⁶, H.S. Peiser⁷, K.J.R. Rosman⁸, and P.D.P. Taylor⁹ in Isotopic Compositions of the Elements, 2001. The relative atomic masses of the isotopes data were published by G. Audi¹⁰, A.H. Wapstra¹¹, and C. Thibault¹² in The 2003 Atomic Mass Evaluation.

These data have been compiled from the above sources for the user's convenience and does not represent a critical evaluation by the NIST Physical Measurement Laboratory.

1. M. E. Wieser : Department of Physics and Astronomy, University of Calgary, Canada
2. M. Berglund : European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Belgium
3. J.K. Böhlke : United States Geological Survey, Reston, Virginia, USA
4. J.R. de Laeter : Department of Applied Physics, Curtin University of Technology, Australia
5. P. De Bièvre : Independent Consultant on Metrology in Chemistry, Belgium
6. H. Hidaka : Department of Earth and Planetary Systems Science, Hiroshima University, Japan
7. H. S. Peiser : United States Geological Survey, Reston, Virginia, USA
8. K. J. R. Rosman : Department of Applied Physics, Curtin University of Technology, Australia
9. P. D. P. Taylor : Institute for Reference Materials and Measurements, European Commission, Belgium
10. G. Audi : Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Orsay Campus, France
11. A. H. Wapstra : National Institute of Nuclear Physics and High-Energy Physics, Amsterdam, The Netherlands
12. C. Thibault : Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Orsay Campus, France