Lr
Lawrencium
Atomic number: 103Mass: 266 uCategory: Actinide
About Lawrencium
Lawrencium is a synthetic chemical element and the final member of the actinide series. It was named after Ernest Lawrence, inventor of the cyclotron. Its most stable isotope has a half-life of 27.8 hours.
Properties
Period
7
Group
3
Block
F
Category
Actinide
Electronegativity
1.30 (Pauling)
Ionization Energy
479 kJ/mol
Melting Point
1900 K (1627°C)
Boiling Point
Unknown
Density
Unknown
Oxidation States
+3
Electron Configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p⁶ 5f¹⁴ 7s² 7p¹
[Rn] 5f¹⁴ 7s² 7p¹
Shell 1:2e⁻
Shell 2:8e⁻
Shell 3:18e⁻
Shell 4:32e⁻
Shell 5:32e⁻
Shell 6:8e⁻
Shell 7:3e⁻
Real-World Uses
Research only
Scientific studies
No practical applications
Nuclear physics
Fundamental science
Fun Fact
Lawrencium closes out the actinide series — it's the last element whose chemistry follows the actinide pattern before the super-heavy elements begin!