Beryllium vs Boron
Pick up to 3 elements and see how they stack up.
| Property | Beryllium | Boron |
|---|---|---|
| Atomic number | 4 | 5 |
| Atomic mass | 9.0122 | 10.81 |
| Electronegativity | 1.57 | 2.04 |
| Melting point | 1,560 K (1,286.8 °C) | 2,349 K (2,075.8 °C) |
| Boiling point | 2,742 K (2,468.8 °C) | 4,200 K (3,926.8 °C) |
| Density | 1.85 g/cm³ | 2.34 g/cm³ |
| Atomic radius | 153 pm | 192 pm |
| Ionization energy | 9.323 eV | 8.298 eV |
| Discovered | 1798 | 1808 |
| Category | Alkaline earth metal | Metalloid |
| State at room temp. | Solid | Solid |
| Block | s | p |
| Group | 2 | 13 |
| Period | 2 | 2 |
| Valence electrons | 2 | 3 |
| Common charges | +2 | +3 |
| Electron configuration | [He] 2s2 | [He] 2s2 2p1 |