Hf
Hafnium
72
Atomic Number: 72
Atomic mass: 178.492
Ionization energy: 659
Electronaffinity: 0
Covalent radius: 150
Calculated radius: 208
Empirical radius: 155
Vanderwaals radius:
Electronegativity: 1.3
Density: 13.31
Oxidation states: 2, 3, 4
Melting point: 2506
Boiling point: 4876
Electron configuration: [Xe] 4f14 5d2 6s2
Element group: 4
Element period: 6

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