Zirconium vs Hafnium
Pick up to 3 elements and see how they stack up.
| Property | Zirconium | Hafnium |
|---|---|---|
| Atomic number | 40 | 72 |
| Atomic mass | 91.224 | 178.49 |
| Electronegativity | 1.33 | 1.3 |
| Melting point | 2,128 K (1,854.8 °C) | 2,506 K (2,232.8 °C) |
| Boiling point | 4,650 K (4,376.8 °C) | 4,876 K (4,602.8 °C) |
| Density | 6.52 g/cm³ | 13.31 g/cm³ |
| Atomic radius | 186 pm | 212 pm |
| Ionization energy | 6.634 eV | 6.825 eV |
| Discovered | 1789 | 1923 |
| Category | Transition metal | Transition metal |
| State at room temp. | Solid | Solid |
| Block | d | d |
| Group | 4 | 4 |
| Period | 5 | 6 |
| Valence electrons | 2 | 2 |
| Common charges | +4 | +4 |
| Electron configuration | [Kr] 4d2 5s2 | [Xe] 4f14 5d2 6s2 |