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.
Atomic number: 62
Atomic weight: 150.36
Group, period, block: n/a, 6, f
Color: silvery white
Electron configuration: 6s2 4f6
Density: 7.52 g/cm-3
Melting point: 1345 K,1072 °C,1962 °F
Boiling point: 2067 K,1794 °C,3261 °F
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
There are seven naturally occurring isotopes of samarium exist, 144Sm, 147Sm, 148Sm, 149Sm, 150Sm, 152Sm, and 154Sm.