Hafnium
Electron Configuration
|
General Properties
| Atomic Symbol | Hf |
| Atomic Weight | 178.49 g/mol |
| Element Number | 72 |
| Standard State | Solid |
| Standard Type | Strongly Basic |
| Date of Discovery | 1922 |
| Discoverer | Coster & Hevesy |
Physical Properties
| Oxidation States | 4 |
| Boiling Point | 4875 K |
| Melting Point | 2504 K |
| Density | 13.31 g/cm³ |
| Electron Configuration | [Xe]4f14,5d2,6s2 |
| Acid/Base Properties | Amphoteric |
| Crystal Structure | Hexagonal |
| Electronegativity | 1.3 |
| Heat of Vaporization | 661.07 kJ/mol |
| Heat of Fusion | 21.76 kJ/mol |
| Electrical Conductivity | 3.4 10^6omg-¹cm-¹ |
| Thermal Conductivity | 23.0 Wm-¹K-¹ (at 300 K) |
| Specific Heat Capacity | 0.14 Jg-¹K-¹ (at 300 K) |
| First Ionization Potential | 6.65 |
| Atomic Volume | 13.6 cm³/mol |
| Atomic Radius | 1.67 Å |
| Covalent Radius | 1.44 Å |
| Synthetic | No |