Hafnium

Atomic symbol: Hf
Atomic number: 72
Atomic mass: 178.49

Appearance: Steel gray solid at 25°C

Group: 4
Period: 6
Series: Transition metals
Block: d
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d² 6s²

Used in alloys and to make nuclear control rods.

Very resistant to corrosion.

Fun Fact! Hafnium is not found alone in nature, instead, it is almost always found combined with zirconium.