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24
Cr
51.996
Chromium
Transition metals · Group 6 · Period 4
Atomic properties
| Atomic number | 24 |
|---|---|
| Symbol | Cr |
| Standard atomic weight | 51.996 |
| Classification | Transition metals |
| Group | 6 |
| Period | 4 |
| Block | d-block |
| Electron configuration | [Ar] 3d5 4s1 |
| Electronegativity (Pauling) | 1.66 |
| Common oxidation states | +6, +3, +2 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 7.19 g/cm³ |
| Melting point | 1907 °C |
| Boiling point | 2671 °C |
| Discovered | 1797 |
| CAS number | — |