Hafnium
Transition metal| Atomic number | 72 |
|---|---|
| Category | Transition metal |
| Atomic mass | 178.49 |
| Electron configuration | [Xe]4f¹⁴ 5d² 6s² |
| Oxidation states | +4 |
| Electronegativity | 1.3 |
| Melting point | 2,233 °C |
| Boiling point | 4,603 °C |
| Density | 13.31 g/cm³ |
| Crystal structure | Close-packed hexagonal |
| Group | 4 |
| Period | 6 |
| Block | d |
| Discovered | 1,923 |
| Crustal abundance | 3 ppm |
