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62Sm150.362
Samarium
LanthanideSamarium is a chemical element with symbol Sm and atomic number 62. It is a moderately hard silvery metal that readily oxidizes in air. Being a typical member of the lanthanide series, samarium usually assumes the oxidation state +3.
Phase: SolidAppearance: silvery white
2, 8, 18, 24, 8, 2
Physical Properties
Atomic Mass150.362 u
Density7.52 g/cm³
Melting Point1345 K
Boiling Point2173 K
Molar Heat29.54 J/(mol·K)
Period6
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f6
Semantic Config[Xe] 4f6 6s2
Shells2, 8, 18, 24, 8, 2
Electron Affinity15.63 kJ/mol
Electronegativity1.17
Ionization Energies
IE1: 544.5 kJ/molIE2: 1070 kJ/molIE3: 2260 kJ/molIE4: 3990 kJ/mol
Discovery
Discovered byLecoq de Boisbaudran