103Actinide · Group 3 · Period 7
Lawrencium
Lawrencium (Lr) is element 103, a actinide in the d-block — group 3, period 7. It is a solid at room temperature with 7 electron shells (2, 8, 18, 32, 32, 8, 3) and an atomic mass of 266 u.
- Atomic mass
- 266.0 u
- Phase · STP
- solid
- Melting
- 1900 K · 1627 °C
- Boiling
- —
- Electronegativity
- 1.3
- Density
- —
Photograph — Chemical Elements A Virtual Museum under a Creative Commons Attribution 3.0 Unported License, source: https://images-of-elements.com/lawrencium.php
Identity
- Atomic number
- 103
- Standard atomic weight
- 266.0 u
- Category
- Actinide
- Group
- 3
- Period
- 7
- Block
- d-block
- Oxidation states
- +3
Physical properties
- Melting point
- 1900 K · 1627 °C
- Boiling point
- —
- Density
- —
- Molar heat capacity
- —
- Atomic radius
- —
- Electron affinity
- -30.04 kJ/mol
Atomic structure
103protons
163neutrons
103electrons
3valence e⁻
- Noble-gas notation
- [Rn] 5f14 7s2 7p1
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 7p1
- Electrons per shell
- 2, 8, 18, 32, 32, 8, 3
Periodic trends
Where Lawrencium ranks across all 118 elements.
Discovery
- Discovered
- 1961
- Discovered by
- Lawrence Berkeley National Laboratory
- Named by
- —
- Appearance
- —