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.
Experiment with the elements
Lawrencium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.