Lawrencium

Atomic symbol: Lr
Atomic number: 103
Atomic mass: 262

Appearance: Silver solid at 25°C

Group: 3
Period: 7
Series: Actinides
Block: d
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f¹⁴ 7s² 7p¹

Synthetic, highly radioactive metal.

Fun Fact! Named after nuclear physicist Ernest Lawrence.