103 Lr 266
Lawrencium
Actinide
Lawrencium (Lr) is a chemical element with atomic number 103, classified as a actinide. At room temperature it is a solid. It was discovered in 1961 by Albert Ghiorso et al..
Properties
- Atomic number
- 103
- Atomic mass
- 266 u
- Category
- Actinide
- Group
- 3
- Period
- 7
- Block
- d-block
- Electron configuration
- [Rn] 5f¹⁴ 6d¹ 7s²
- Phase at STP
- Solid
- Density
- —
- Melting point
- 1900 K (1626.8 °C)
- Boiling point
- —
- Electronegativity
- —
- Atomic radius
- —
- Ionization energy
- 4.96 eV
- Discovery
- 1961 · Albert Ghiorso et al.
Common uses
Research only
Did you know?
Last of the actinides and named after Ernest Lawrence.