atomic weight: References & Edit History
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Article Contributors
Primary Contributors
- H. Steffen Peiser
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Edward Wichers
Associate Director, National Bureau of Standards, U.S. Department of Commerce, Washington, D.C., 1958–62; Chief, Division of Chemistry, 1948–58. Author of papers on chemical reagents, pure substances, and atomic weights.
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Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Invalidated site: Office of Environment, Health, Safety and Security - What Are Atomic Number and Atomic Weight? | Sep 26, 2024 | ||
| Add new Web site: Office of Environment, Health, Safety and Security - What Are Atomic Number and Atomic Weight? | Sep 25, 2024 | ||
| Add new Web site: Chemistry LibreTexts - Atomic Weights. | Sep 20, 2022 | ||
| Article revised and updated. | Jul 22, 2020 | ||
| "Relative atomic mass" added as a variant term. | Mar 22, 2016 | ||
| Changed "the atomic weight of carbon is 12.01074" to "the atomic weight of helium is 4.002602." Added material about atomic weights and their uncertainties. | Mar 22, 2016 | ||
| Add new Web site: How Stuff Works - Science - Periodic Table. | Sep 30, 2011 | ||
| Add new Web site: University of Colorado at Boulder - Atomic Weight. | Sep 30, 2011 | ||
| Add new Web site: Indiana University - Atomic Weight. | Sep 30, 2011 | ||
| Add new Web site: Royal Society of Chemistry - Atomic Weights. | Sep 30, 2011 | ||
| Add new Web site: University of Wisconsin - Atomic Weight. | Sep 30, 2011 | ||
| Add new Web site: Fact Monster - Science - Atomic Weight. | Sep 28, 2011 | ||
| The words "atomic numbers" modified to "atomic mass numbers." | Jan 11, 2011 | ||
| Added URL to topic: Fact Monster - Chinese New Year. | Aug 18, 2009 | ||
| Cross-references added. | Mar 18, 2008 | ||
| Article revised and updated. | Dec 21, 2006 | ||
| Article revised. | Mar 21, 1999 | ||
| Article added to new online database. | Jul 20, 1998 |
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