Chromium
Transition Metal
Chromium (Cr) is a chemical element with atomic number 24, classified as a transition metal. At room temperature it is a solid. It was discovered in 1797 by Louis Nicolas Vauquelin.
Properties
- Atomic number
- 24
- Atomic mass
- 51.996 u
- Category
- Transition Metal
- Group
- 6
- Period
- 4
- Block
- d-block
- Electron configuration
- [Ar] 3d⁵ 4s¹
- Phase at STP
- Solid
- Density
- 7.15 g/cm³
- Melting point
- 2180 K (1906.8 °C)
- Boiling point
- 2944 K (2670.8 °C)
- Electronegativity
- 1.66
- Atomic radius
- 166 pm
- Ionization energy
- 6.767 eV
- Discovery
- 1797 · Louis Nicolas Vauquelin
Common uses
Stainless steel, chrome plating, pigments, tanning leather
Did you know?
Creates the brilliant shine on chrome bumpers and makes rubies red.