Beryllium vs Hafnium
| Property | Be Beryllium | Hf Hafnium |
|---|---|---|
| Atomic number | 4 | 72 |
| Symbol | Be | Hf |
| Name | Beryllium | Hafnium |
| Category | alkaline-earth-metal | transition-metal |
| Standard Atomic Weight | 9.012183 u | 178.49 u |
| Period | 2 | 6 |
| Group | 2 | 4 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s2 | [Xe]6s24f145d2 |
| Oxidation states | [0, 1, 2] | [-2, 0, 1, 2, 3, 4] |
| Electronegativity (Pauling) | 1.57 | 1.3 |
| Electron affinity | -0.52 eV | 0.178 eV |
| Density | 1850 kg/m³ | 1.330000e+4 kg/m³ |
| Melting point | 1286.85 °C | 2232.85 °C |
| Boiling point | 2470.85 °C | 4602.85 °C |
| Discovery year | 1797 | 1911 |