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.
Compounds you can make with chromium
Chromium appears in one compound in our periodic table sandbox. Each one is a real substance with its true chemical formula — combine the right elements in the right ratio below to discover it.
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Cr2O3
Chromium(III) Oxide
A durable green pigment used in paints, ceramics, and polishing compounds.