Krypton vs Hafnium
| Property | Kr Krypton | Hf Hafnium |
|---|---|---|
| Atomic number | 36 | 72 |
| Symbol | Kr | Hf |
| Name | Krypton | Hafnium |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 83.798 u | 178.49 u |
| Period | 4 | 6 |
| Group | 18 | 4 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ar]4s23d104p6 | [Xe]6s24f145d2 |
| Oxidation states | [0, 1, 2] | [-2, 0, 1, 2, 3, 4] |
| Electronegativity (Pauling) | 3 | 1.3 |
| Electron affinity | -1 eV | 0.178 eV |
| Density | 3.733 kg/m³ | 1.330000e+4 kg/m³ |
| Melting point | -157.36 °C | 2232.85 °C |
| Boiling point | -153.42 °C | 4602.85 °C |
| Discovery year | 1898 | 1911 |