Atomic Number 62     Atomic Mass 150.36     Density 7.520 g/mL

State solid     Color silvery white      Electronegativity 1.17

Melting Point 1077°C      Boiling Point 1791°C

Natural Isotopes Sm-144 3.1%   Sm-147 15.0%   Sm-148 11.3%
   Sm-149 13.8%   Sm-150 7.4%   Sm-152 26.7%    Sm-154 22.7%

Abbreviated Electron Configuration [Xe] 4f⁶ 6s¹

Discovered by Paul Emile Lecoq de Boisbaudran in 1879.