Beryllium vs Boron
| Property | Be Beryllium | B Boron |
|---|---|---|
| Atomic number | 4 | 5 |
| Symbol | Be | B |
| Name | Beryllium | Boron |
| Category | alkaline-earth-metal | metalloid |
| Standard Atomic Weight | 9.012183 u | 10.8135 u |
| Period | 2 | 2 |
| Group | 2 | 13 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s2 | [He]2s22p1 |
| Oxidation states | [0, 1, 2] | [-5, -1, 0, 1, 2, 3] |
| Electronegativity (Pauling) | 1.57 | 2.04 |
| Electron affinity | -0.52 eV | 0.27972 eV |
| Density | 1850 kg/m³ | 2370 kg/m³ |
| Melting point | 1286.85 °C | 2074.85 °C |
| Boiling point | 2470.85 °C | 3999.85 °C |
| Discovery year | 1797 | 1808 |