| From Wikipedia, the free encyclopediaSamarium 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. | |||||||||
Samarium in the periodic table | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Symbol | Sm | ||||||||
| Atomic number | 62 | ||||||||
| Group | 0 | ||||||||
| Period | 6 | ||||||||
| Block | f | ||||||||
| Element category | Lanthanide | ||||||||
Physical properties | |||||||||
| Phase at STP | Solid | ||||||||
| Density | 7.52 g/cm3 | ||||||||
| Atomic weight | 150.362 u | ||||||||
| Melting point | 1345 K 1071.85 °C 1961.33 °F | ||||||||
| Boiling point | 2173 K 1899.85 °C 3451.73 °F | ||||||||
Atomic properties | |||||||||
| Electronegativity (Pauling Scale) | 1.17 | ||||||||
| Electron affinity | 15.63 kJ/mol | ||||||||
| Oxidation states | 0, +2, +3 (a mildly basic oxide) | ||||||||
| Ionization energies |
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Electron configuration | |||||||||
| Elektronkonfiguration (shorthand) | [Xe] 4f6 6s2 | ||||||||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f6 5s2 5p6 6s2 | ||||||||
| Electrons per shell | 2, 8, 18, 24, 8, 2 | ||||||||
History | |||||||||
| Discovered | 1879 | ||||||||
| Discovered by | Lecoq de Boisbaudran | ||||||||