Spedding, Frank H. Formerly, Ames Laboratory, Energy Research and Development Administration, Iowa State University, Ames, Iowa.
- Additional Readings
A chemical element, Sm, atomic number 62, belonging to the rare-earth group. Its atomic weight is 150.35, and there are seven naturally occurring isotopes; 147Sm, 148Sm, and 149Sm are radioactive and emit α particles. See also: Periodic table
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