Periodic Table of Elements




Samarium was discovered by French chemist, Jean Charles Galissard de Marignac in Switzerland in 1853. It was isolated in France in 1879 by the French chemist Paul Emile Lecoq de Boisbaudran.

Name: Samarium
Symbol: Sm
Atomic number: 62
Atomic weight: 150.36
State: solid
Group, period, block: n/a, 6, f
Color: silvery white
Classification: lanthanide
Electron configuration: 6s2 4f6

Physical properties

Density: 7.52 g/cm-3
Melting point: 1345 K,1072 C,1962 F
Boiling point: 2067 K,1794 C,3261 F

Atomic properties

Oxidation states: 4, 3, 2, 1
Electronegativity: 1.17 (Pauling scale)
Ionization energies: 1st: 544.5 kJmol-1
Covalent radius: 1988 pm
Van der Waals radius: no data
  • Sm
  • Electron Configuration


There are seven naturally occurring isotopes of samarium exist, 144Sm, 147Sm, 148Sm, 149Sm, 150Sm, 152Sm, and 154Sm.