Atomic weights of the elements 2009 (IUPAC Technical Report)

  title={Atomic weights of the elements 2009 (IUPAC Technical Report)},
  author={Michael E. Wieser and Tyler B. Coplen},
  journal={Pure and Applied Chemistry},
  pages={359 - 396}
The biennial review of atomic-weight determinations and other cognate data has resulted in changes for the standard atomic weights of 11 elements. Many atomic weights are not constants of nature, but depend upon the physical, chemical, and nuclear history of the material. The standard atomic weights of 10 elements having two or more stable isotopes have been changed to reflect this variability of atomic-weight values in natural terrestrial materials. To emphasize the fact that these standard… 

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...................................................... Introduction...................................................................^ Basic Concepts