PERIODIC ELEMENT
Zr (Zirconium)
| Atomic number | : | 40 |
| Atomic mass | : | 91.22 g.mol-1 |
| Electronegativity according to Pauling | : | 1.2 |
| Density | : | 6.49 g.cm-3 at 20 °C |
| Melting point | : | 1852 °C |
| Boiling point | : | 4400 °C |
| Vanderwaals radius | : | 0.160 nm |
| Ionic radius | : | 0.08 nm (+4) |
| Isotopes | : | 11 |
| Electronic shell | : | [Kr] 4d25s2 |
| Energy of first ionisation | : | 669 kJ.mol-1 |
| Energy of second ionisation | : | 1346 kJ.mol-1 |
| Energy of third ionisation | : | 2312 kJ.mol-1 |
| Energy of fourth ionisation | : | 3256 kJ.mol-1 |
| Discovered by | : | Martin Klaproth in 1789 |
| Atomic Structure | Uses (nuclear applications) | |