Element 62
Samarium (Sm)
Samarium (Sm) is element 62 of the periodic table, a lanthanide in period 6 (f-block) with an atomic mass of 150.36 and is a solid at standard conditions.
At a glance
- Atomic number
- 62
- Symbol
- Sm
- Atomic mass
- 150.36 u
- Category
- Lanthanides
- Period
- 6
- Block
- f-block
- Phase at STP
- solid
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f6 5s2 5p6 6s2
- Shorthand configuration
- [Xe] 4f6 6s2
- Electrons per shell
- 2, 8, 18, 24, 8, 2
- Oxidation states
- +2, +3
Physical properties
- Melting point
- 1345 K
- Boiling point
- 2067 K
- Density
- 7.52 g/cm3
- Phase
- solid
Atomic properties
- Electronegativity (Pauling)
- 1.17
- Atomic radius
- 238 pm
- Covalent radius
- 198 pm
- First ionization energy
- 545 kJ/mol
- Electron affinity
- 50 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Sm-152 | 151.91973 | 26.75% | Stable |
Common uses
- Magnets
- Cancer treatment
- Lasers
- Nuclear reactor control
Discovery
- Year
- 1879
- Discovered by
- Paul Emile Lecoq de Boisbaudran
- Country
- France