62Sm150.362
Lanthanidef-block
Samarium
Element 62 on the periodic table, symbol Sm, group 3, period 6.
Samarium 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.
Appearance: silvery white
Properties
- Atomic Number
- 62
- Atomic Mass
- 150.3620 u
- Group
- 3
- Period
- 6
- Block
- f-block
- Category
- Lanthanide
- State at 25 °C
- Solid
- Melting Point
- 1,345 K · 1,071.9 °C
- Boiling Point
- 2,173 K · 1,899.9 °C
- Density
- 7.52 g/cm³
- Atomic Radius
- 185 pm
- Electronegativity
- 1.17
- Oxidation States
- +2, +3
- Abundance in Crust
- 7.05 mg/kg
- Discovered
- 1879
- Discovered By
- Lecoq de Boisbaudran
Electron Configuration
[Xe] 4f6 6s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f6
Ionisation Energies (kJ/mol)
- 1. 544.5
- 2. 1,070
- 3. 2,260
- 4. 3,990
Elements near Samarium
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.