24
Cr
Chromium
Chromium
Chromium (Cr)
Transition Metals · Solid · Period 4 · Group 6
Element Properties
- Atomic Number
- 24
- Symbol
- Cr
- Atomic Mass
- 51.996
- Category
- Transition Metals
- Standard State
- Solid
- Period
- 4
- Group
- 6
- Electronegativity
- 1.66
- Atomic Radius
- 189
- Ionization Energy
- 6.77
- Electron Affinity
- 0.67
- Oxidation States
- +6, +3, +2
- Melting Point
- 2180 K (1906.85 °C)
- Boiling Point
- 2944 K (2670.85 °C)
- Density
- 7.15
- Electron Configuration
- [Ar]3d5 4s1
- Year Discovered
- 1797
Electron shells
[Ar]3d5 4s1
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Chromium?
The atomic number of Chromium is 24, which equals the number of protons in its nucleus.
What is the atomic mass of Chromium?
The atomic mass of Chromium is approximately 51.996 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Chromium?
The electron configuration of Chromium is [Ar]3d5 4s1.
Where is Chromium in the periodic table?
Chromium is located in period 4, group 6.
When was Chromium discovered?
Chromium was discovered in 1797.