Hafnium
| Basic Information | Crystal Structure | Isotope | Facts | Related Links |
| Symbol: | Hf |
| Atomic Number: | 72 |
| Atomic weight: | 178.49u |
| Melting Point: | 2500K |
| Boiling Point: | 4876K |
| Number of Protons/Electrons: | 72 |
| Number of Neutrons: | 106 |
| Classification: | Transition Metal |
| Crystal Structure: | Hexagonal |
| Density at 293 K: | 13.1g/mL |
| Color: | Silver |
| Bonding radius: | 1.44A |
| Atomic radius: | 2.16A |
| Ionization Potential: | 6.65V |
| Electronegativity: | 1.3 |
| Heat of vaporization: | 575kJ/mol |
| Heat of fusion: | 24.06kJ/mol |
| Specific heat: | 0.14J/gK |
| Electron configuration: | [Xe]4f145d26s2 |
Crystal Structure
| Isotope | Half Life |
| Hf172 | 1.9 years |
| Hf174 | 2.0E15 years |
| Hf175 | 70 days |
| Hf176 | Stable |
| Hf177 | Stable |
| Hf178 | Stable |
| Hf179 | Stable |
| Hf180 | Stable |
| Hf181 | Stable |
| Hf182 | Stable |
| Date of Discovery: | 1923 |
| Discoverer: | Dirk Coster |
| Uses: | Nuclear reactors |
| Obtained From: | Zircon |