24 · Cr
Chromium
Isolated by Vauquelin in 1797.
Identity
- Atomic number
- 24
- Symbol
- Cr
- Canonical name
- Chromium
- Category
- transition metal
- Group
- 6
- Period
- 4
- Block
- d
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 51.99616 u
- Electron configuration
- [Ar] 3d5 4s1
- Electrons per shell
- 2, 8, 13, 1
- Standard state
- solid
- Density
- 7.19 g/cm³
- Melting point
- 2,180 K
- Boiling point
- 2,944 K
- Electronegativity
- 1.66 Pauling
- First ionization energy
- 652.9 kJ/mol
- Electron affinity
- 65.21 kJ/mol
History
Chromium in red lead ore
Discovery · confirmed · 1797
Vauquelin isolates chromium from crocoite.
Etymology
- Theme
- color
- Language
- grec
- Root
- chroma
- Meaning
- color
Scientists
Places and institutions
- Paris — historical setting : France — present country : France
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements