| Atomic number | : | 20 |
| Atomic mass | : | 40.08 g.mol-1 |
| Electronegativity according to Pauling | : | 1.0 |
| Density | : | 1.6 g.cm-3 at 20 °C |
| Melting point | : | 840 °C |
| Boiling point | : | 1484 °C |
| Vanderwaals radius | : | 0.197 nm |
| Ionic radius | : | 0.099 nm |
| Isotopes | : | 10 |
| Electronic shell | : | [Ar] 4s2 |
| Energy of first ionisation | : | 589.6 KJ.mol-1 |
| Energy of second ionisation | : | 1145 KJ.mol-1 |
| Standard potential | : | - 2.87 V |
| Discovered by | : | Sir Humphrey Davy in 1808 |
Periodic Table of Elements
