Article
Article
Lutetium
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/10.1036/1097-8542.392500
A chemical element, Lu, atomic number 71, atomic weight 174.97, a very rare metal and the heaviest member of the rare-earth group. The naturally occurring element is made up of the stable isotope 175Lu, 97.41%, and the long-life β-emitter 176Lu with a half-life of 2.1 × 1010 years. See also: Periodic table
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