NO. 062Lanthanide

Sm

Samarium

Samarium is a reactive rare earth metal used in permanent magnets and nuclear reactor control rods.

Crystal Structure

Rhombohedral

Atomic Mass150.36 u

Density7.52 g/cm³

Melting Point1345 K

Boiling Point2067 K

Atomic Radius180 pm

Electronegativity1.17

Ionization Energy545 kJ/mol

Electron Affinity50 kJ/mol

Bonding TypeMetallic

Oxidation States2, 3

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Xe] 4f6 6s2

Discovered ByPaul-Émile Lecoq de Boisbaudran

Year1879

Known Isotopes

Sm-144Sm-147Sm-148Sm-149Sm-150Sm-152Sm-154