Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Hafnium | |
| Electron Configuration | 2,8,18,32,10,2 |
| Electron Configuration | [Xe]] 4f14 5d2 6s2 |
| Electronegativity | 1.3 |
| Enthalpy of Fusion | 25.5 kJ mol-1 |
| Enthalpy of Vaporisation | 570.7 kJ mol-1 |
| Heat Capacity | 25.73 J mol-1 K-1 |
| Thermal Conductivity | 23.0 W m-1 K-1 |
| Thermal Expansion | 5.9 μm m-1 K-1 |
| Magnetic ordering | No data |
| Electrical resistivity | 331 Ω m |
| Speed of sound | 3010 m s-1 |
| Young's modulus | 78 GPa |
| Shear modulus | 3010 GPa |
| Bulk modulus | 110 GPa |
| Poisson ratio | 0.37 |
| Mohs hardness | 5.5 |
| Vickers hardness | 1760 MPa |
| Brinell hardness | 1700 MPa |
| Atomic Radii |
|
| Atomic Radius
|
155 pm |
| Bohr Radius
|
208 pm |
| Covalent Radius
|
150 pm |
| Van der Waals
|
0 pm |
| Oxidation States |
|
| Main
|
Hf+4 |
| Other
|
Hf+1, Hf+2, Hf+3 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
642 |
| M+ - M2+ |
1440 |
| M2+ - M3+ |
2250 |
| M3+ - M4+ |
3216 |