Zirconium |
| Symbol | Zr |
|---|---|
| Latin name | Zirkonium |
| Atomic number | 40 |
| Period | 5 |
| Element category | Transition elements |
| Relative atomic mass | 91.244 |
| Group | IV.B |
| Electronegativity | 1.4 |
| Oxidation numbers | 4 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d2 5s2 |
| Density [g/cm3] | 6.506 |
| State | Solid |
| Melting point [°C] | 1852 |
| Boiling point [°C] | 3800 |
| Atomic radius [pm] | 206 |
| Covalent radius [pm] | 148 |
| Thermal conductivity [W m-1K-1] | 22.7 |
| Heat capacity [J K-1g-1] | 0.278 |
| Discovery | 1789 |
| Hardness [Mohs scale] | 5.0 |
| Vickers hardness [MPa] | 903 |
| Brinell hardness [MPa] | 650 |
| Young's modulus [GPa] | 68 |
| Electrical conductivity [S m-1] | 2.3 · 106 |
| Shear modulus [GPa] | 33 |
| 1.st ionization energy [eV] | 6.6339 |
| 2.nd ionization energy [eV] | 13.13 |
| 3.rd ionization energy [eV] | 22.99 |
| Stable isotopes | 5 |
| Unstable isotopes | 16 |