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
2,8,18,24,8,2
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 kJ·mol-1
Covalent radius: 198±8 pm
Van der Waals radius: no data
- Sm
Electron Configuration
Isotopes
There are seven naturally occurring isotopes of samarium exist, 144Sm, 147Sm, 148Sm, 149Sm, 150Sm, 152Sm, and 154Sm.