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Chromium (Cr)
Atomic number 24 · transition
| Atomic number | 24 |
|---|---|
| Atomic mass | 51.9961 u |
| Molar mass | 51.9961 g/mol |
| Category | transition |
| Group / period / block | 6 / 4 / d |
| Electron configuration | [Ar] 3d5 4s |
| Electrons per shell | 2, 8, 13, 1 |
| Electronegativity (Pauling) | 1.66 |
| Atomic radius | 140.0 pm |
| Density | 7.15 g/cm³ |
| First ionisation energy | 6.7665 eV |
| Melting point | 2180.15 K (1907.00 °C) |
| Boiling point | 2944.15 K (2671.00 °C) |
| Common oxidation states | +3, +6 |
| Abundance in Earth's crust | 102 ppm |
Uses
Stainless steel, chrome plating
Discovery
1797, Louis Vauquelin