Article
Article
Europium
Article By:
Spedding, Frank H. Formerly, Ames Laboratory, Energy Research and Development Administration, Iowa State University, Ames, Iowa.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.246200
A chemical element, Eu, atomic number 63, atomic weight 151.96, a member of the rare-earth group. The stable isotopes, 151Eu and 153Eu, make up the naturally occurring element. The metal is the second most volatile of the rare earths and has a considerable vapor pressure at its melting point. It is very soft, is rapidly attacked by air, and really belongs more to the calcium-strontium-barium series than to the rare-earth series. See also: Periodic table
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