Americium

Atomic symbol: Am
Atomic number: 95
Atomic mass: 243

Appearance: Silvery white solid at 25°C

Group: 3
Period: 7
Series: Actinides
Block: f
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f⁷ 7s²

Produced synthetically via the beta-particle decay of plutonium-241.

Dense and highly radioactive.

Fun Fact! Americium was so difficult to isolate that it was originally named “pandemonium”!