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Samarium

Metalsolid
Symbol: Sm
Atomic number: 62
Atomic mass: 150.36
Group: Lanthanide
CAS-number: 7440-19-9

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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 24, 8, 2
Orbitals: [Xe] 4f6 6s2
Electronegativity: --, 1.1
1. Ionization potential: 5.6437 eV
2. Ionization potential: 11.069 eV
3. Ionization potential: 23.423 eV
Oxidation states: 3, 2
Electrical conductivity: 0.00956 10^6
Melting point: 1074 °C
Boiling point: 1794 °C
Specific heat: 0.20 J/gK
Heat of fusion: 8.630 kJ/mol
Heat of vaporization: 166.40 kJ/mol
Thermal conductivity: 0.133 W/cmK
Atomic radius: 2.59 Å
Ionic radius: 1.08 Å (+3)
Covalent radius: 1.62 Å
Atomic volume: 19.95 cm³/mol
Density (293 K): 7.54 g/cm³
Crystal structure: rhombohedral
rhombohedral

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
144Sm 3.09 143.912 0 -- --
145Sm 0 145 7/2 340d EC View
146Sm 0 145.913 0 1.03E08y α View
147Sm 14.97 146.915 7/2 1.06E11y α View
148Sm 11.24 147.915 0 7E15y α View
149Sm 13.83 148.917 7/2 -- --
150Sm 7.44 149.917 0 -- --
151Sm 0 151 5/2 90.0y β- View
152Sm 76.72 151.92 0 -- --
153Sm 0 153 3/2 1.929d β- View
154Sm 22.71 153.922 0 -- --

Other info

Name origin:Named after the mineral samarskite.
Description:Silvery rare earth metal.
Discovered by:Paul émile Lecoq de Boisbaudran
Year:1879
Place:France
Sources:Found with other rare earths in monazite sand. The sand is often 50% rare earths by mass and 2.8% samarium.
Use(s):It is used in the electronics and ceramics industries. It is easily magnetized and very difficult to demagnetize. This suggests important future applications in solid-state and superconductor technologies.