Samarium
Samarium (钐, symbol Sm) is chemical element number 62, a Lanthanide in period 6 of the periodic table, with a standard atomic weight of about 150.36. Hard silvery rare earth. Used in powerful samarium-cobalt magnets and cancer treatment.
Properties
| Atomic number | 62 |
|---|---|
| Symbol | Sm |
| Atomic mass | 150.36 u |
| Category | Lanthanide |
| Period | 6 |
| Group | — |
| Electron configuration | [Xe] 4f⁶ 6s² |
| Electronegativity | 1.17 |
| Covalent radius | 198 pm |
| Density | 7.52 g/cm³ |
| Melting point | 1345 K |
| Boiling point | 2067 K |
| Discovery | Lecoq de Boisbaudran, 1879 |
Overview
Hard silvery rare earth. Used in powerful samarium-cobalt magnets and cancer treatment. Samarium (Sm) is a Lanthanide with atomic number 62, located in period 6. As a lanthanide (rare-earth) element it closely resembles its neighbours and serves in magnets, phosphors and catalysts.
Its electron configuration is [Xe] 4f⁶ 6s², with 2 electrons in the outer shell, and an electronegativity of about 1.17 (Pauling). Around 25 °C it is usually a solid; it melts near 1345 K (1071.9 °C), boils near 2067 K (1793.9 °C), has a density around 7.52 g/cm³.
In industry and daily life it turns up in Electronics / Semiconductors and Nuclear. It was first described by Lecoq de Boisbaudran in 1879. See more trends in the visualization center.
Electron shells
Electrons per shell: 2 · 8 · 18 · 24 · 8 · 2
Main uses
- Electronics / Semiconductors
- Nuclear
Hazard
Compounds containing Samarium
No compounds in this knowledge base contain Samarium yet.
Data sources
Atomic mass uses IUPAC (CIAAW) standard atomic weights; the covalent radius is from Cordero et al. (2008). Verify on the RSC Periodic Table, PubChem and Wikipedia. Educational reference only.