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NIST Atomic Weights and Isotopic Compositions with Relative Atomic Masses

Published by National Institute of Standards and Technology | National Institute of Standards and Technology | Catalog Last Checked: August 02, 2025 at 01:30 PM | Dataset Last Updated: July 01, 2010
The atomic weights are available for elements 1 through 118 and isotopic compositions or abundances are given when appropriate. Version 3.0.

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