| Atomic number | : | 5 |
| Atomic mass | : | 10.81 g.mol-1 |
| Electronegativity according to Pauling | : | 2.0 |
| Density | : | 2.3 g.cm-3 at 20 °C |
| Melting point | : | 2076 °C |
| Boiling point | : | 3927 °C |
| Vanderwaals radius | : | 0.098 nm |
| Ionic radius | : | 0.027 nm |
| Isotopes | : | 2 |
| Electronic shell | : | [He] 2s22p1 |
| Energy of first ionisation | : | 800.5 kJ.mol-1 |
| Energy of second ionisation | : | 2426.5 kJ.mol-1 |
| Energy of third ionisation | : | 3658.7 kJ.mol-1 |
| Discovered by | : | Sir Humphry Davy and J.L Gay-Lussac in 1808 |
Periodic Table of Elements
