Beryllium vs Fermium
| Property | Be Beryllium | Fm Fermium |
|---|---|---|
| Atomic number | 4 | 100 |
| Symbol | Be | Fm |
| Name | Beryllium | Fermium |
| Category | alkaline-earth-metal | actinide |
| Standard Atomic Weight | 9.012183 u | 257 u |
| Period | 2 | 7 |
| Group | 2 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s2 | [Rn] 5f12 7s2 |
| Oxidation states | [0, 1, 2] | [2, 3] |
| Electronegativity (Pauling) | 1.57 | 1.3 |
| Electron affinity | -0.52 eV | 0.339 eV |
| Density | 1850 kg/m³ | 9700 kg/m³ |
| Melting point | 1286.85 °C | 1526.85 °C |
| Boiling point | 2470.85 °C | -273.15 °C |
| Discovery year | 1797 | 1952 |