103 Lr
Actinide
Lawrencium
Last actinide.
Properties of Lawrencium
- Atomic number (Z)
- 103
- Symbol
- Lr
- Atomic mass
- 266 g/mol
- Category
- Actinide
- Group
- 3
- Period
- 7
- Electron configuration
- [Rn] 5f¹⁴ 7s² 7p¹
- Electronegativity (Pauling)
- 1.3
- Atomic radius
- —
- First ionization energy
- 470 kJ/mol
- Melting point
- 1900 K (1626.8 °C)
- Boiling point
- —
- Density
- —
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1961
Frequently asked questions
What is Lawrencium?
Lawrencium (Lr) is an actinide, element number 103 on the periodic table. Last actinide.
What is the atomic number and atomic mass of Lawrencium?
Lawrencium has atomic number 103 and an atomic mass of about 266 g/mol.
What is the electron configuration of Lawrencium?
The electron configuration of Lawrencium is [Rn] 5f¹⁴ 7s² 7p¹.
Where is Lawrencium on the periodic table?
Lawrencium sits in group 3, period 7, and is classified as a actinide.