Symbol | Hf | Atomic radius: pm | 156 | Fusion: kJ/Mole | 27.2 |
Name | Hafnium | Ionic radius: pm | (+4)83 | Boiling point: °C | 4603 |
Atomic number | 72 | Electron affinity | ~0 | Melting point: °C | 2233 |
Atomic weight | 178.5 | 1st ion potential | 6.83 | Specific Heat Cap: J/(g K) | 0.14 |
Classification | Trans metal | Natural form | Solid | Thermal Cond: W/(cm K) | 0.23 |
Configuration | [Xe]4f145d26s2 | Crystal structure | Hex | Electrical Cond | 0.0312 |
Oxidation states | 4 | Density | 13.3 | Abundance: mg/kg-crust | 3 |
Electronegativity | 1.3 | Vaporization: kJ/Mole | 661.1 | ||
Hafnium was discovered in 1923 by Dirk Coster and George Charles de Hevesy. | Uses - nuclear control rods, gas-filled and incandescent lamps |