Symbol: Sm
Atomic number: 62
Atomic weight: 150.35
Soft silvery metallic element, belongs to the lanthanoids. Seven natural isotopes, Sm-147 is the only radioisotope, and has a half-life of
2.5*10^11 years. Used for making special alloys needed in the production
of nuclear reactors. Also used as a neutron absorber. Small quantities of
samarium oxide is used in special optical glasses. The largest use of the
element is its ferromagnetic alloy which produces permanent magnets that are five times stronger than magnets produced by any other material.
Discovered by Francois Lecoq de Boisbaudran in 1879.
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