Lithium vs Beryllium
| Property | Li Lithium | Be Beryllium |
|---|---|---|
| Atomic number | 3 | 4 |
| Symbol | Li | Be |
| Name | Lithium | Beryllium |
| Category | alkali-metal | alkaline-earth-metal |
| Standard Atomic Weight | 6.9675 u | 9.012183 u |
| Period | 2 | 2 |
| Group | 1 | 2 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s1 | [He]2s2 |
| Oxidation states | [1] | [0, 1, 2] |
| Electronegativity (Pauling) | 0.98 | 1.57 |
| Electron affinity | 0.61804 eV | -0.52 eV |
| Density | 534 kg/m³ | 1850 kg/m³ |
| Melting point | 180.5 °C | 1286.85 °C |
| Boiling point | 1341.85 °C | 2470.85 °C |
| Discovery year | 1817 | 1797 |