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Vol. 33 No. 2
March-April 2011

PREPRINT -- Atomic Weights—No Longer Constants of Nature

by Tyler B. Coplen and Norman E. Holden

Many of us grew up being taught that the standard atomic weights we found in the back of our chemistry textbooks or on the Periodic Table of the Chemical Elements hanging on the wall of our chemistry classroom are constants of nature. This was common knowledge for more than a century and a half, but not anymore. The following text explains how advances in chemical instrumentation and isotopic analysis has changed the way we view atomic weights and why they are no longer constants of nature. > see FULL TEXT preprint PDF; 124KB

> LINK to USGS Newsroom & press release

> LINK to Pure and Applied Chemistry Technical Report titled "Atomic Weights of the Elements 2009", doi:10.1351/PAC-REP-10-09-14 ; online 2010-12-12

 

!! LINK to the published version !!
Chem Int Vol. 33 No. 2, pp. 10-15, March-April 2011

 


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