Hafnium

Transition metal

Symbol: Hf

Atomic Number: 72

Standard State: Solid

Atomic Mass: 178.49

Electron Configuration: [Xe]6s2 4f14 5d2

Electronegativity: 1.3

Atomic Radius: 212

Ionization Energy: 6.825

Melting Point: 2506

Boiling Point: 4876

Density: 13.3

Year Discovered: 1923