Californium

Atomic symbol: Cf
Atomic number: 98
Atomic mass: 251

Appearance: Silver solid at 25°C

Group: N/a Period: 7
Series: Actinides
Block: f
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f¹⁰ 7s²

Dense and radioactive metal.

Soft and malleable.

Fun Fact! Californium-252 has medical uses for the treatment of cervical cancer.