Issue Date: September 21, 2015 | Web Date: September 17, 2015
Ytterbium Gets A New Atomic Weight
Ytterbium is a bit lighter than previously thought: Its standard atomic weight is now 173.045, down from 173.054, as approved by the International Union of Pure & Applied Chemistry (IUPAC) in August.
The IUPAC Commission on Isotopic Abundances & Atomic Weights evaluates atomic weights every two years. Which elements it tackles depends on what new data are available. This year, only ytterbium made the docket, based on . . .
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