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40
Zr
91.224
Zirconium
Transition metals · Group 4 · Period 5
Atomic properties
| Atomic number | 40 |
|---|---|
| Symbol | Zr |
| Standard atomic weight | 91.224 |
| Classification | Transition metals |
| Group | 4 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 4d2 5s2 |
| Electronegativity (Pauling) | 1.33 |
| Common oxidation states | +4 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 6.52 g/cm³ |
| Melting point | 1855 °C |
| Boiling point | 4409 °C |
| Discovered | 1789 |
| CAS number | — |