Name: Hafnium
Symbol: Hf
Atomic Number: 72
AtomicWeight: 178.490000
Family: transition metals
CAS RN: 7440-58-6
Description: A ductile silvery metal
State (25 °C): Solid
Melting Point: 2506 °K
Boiling Point: 4876 °K
Density: 13.31 g/cm³
Oxidation states: +4
Electron Configuration: [Xe] 4f¹⁴5d²6s²
Radius: 155 pm (Covalent)
Electronegativity: 1.3 (Pauling Scale)

1st Ionization Energy: 659 KJ/mole
2nd Ionization Energy: 1440 KJ/mole
3rd Ionization Energy: 2250 KJ/mole