Chromium (Cr) - Element 24 | Properties & Electron Configuration
What is Chromium?
Chromium (Cr) is element 24, a transition metal in period 4, group 6. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹.
| Atomic Number | 24 |
| Symbol | Cr |
| Atomic Mass | 51.996 u |
| Category | Transition Metal |
| Period | 4 |
| Group | 6 |
| Block | d |
| Electron Configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹ |
| Short Config | [Ar] 3d⁵ 4s¹ |
| Electronegativity | 1.66 |
| Atomic Radius | 140 pm |
| Ionization Energy | 653 kJ/mol |
| Electron Affinity | 64 kJ/mol |
| Phase (STP) | Solid |
Electron Configuration
The full electron configuration of Chromium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹. In noble gas shorthand, this is written as [Ar] 3d⁵ 4s¹.
Chromium is a d-block element in group 6, period 4.
Periodic Trends
Electronegativity: Chromium has a Pauling electronegativity of 1.66. Within group 6, electronegativity generally decreases down the group.
Atomic Radius: 140 pm. Across period 4, atomic radius generally decreases left to right as nuclear charge increases.
Ionization Energy: 653 kJ/mol. Ionization energy generally increases across a period and decreases down a group.
View all 118 elements with trend overlays for electronegativity, atomic radius, ionization energy, and electron affinity.
Explore Chromium on the Interactive Periodic TableRelated Topics
Molybdenum (Mo)
Properties of Molybdenum - same group as Chromium
Tungsten (W)
Properties of Tungsten - same group as Chromium
Seaborgium (Sg)
Properties of Seaborgium - same group as Chromium
Potassium (K)
Properties of Potassium - same period as Chromium
Calcium (Ca)
Properties of Calcium - same period as Chromium
Scandium (Sc)
Properties of Scandium - same period as Chromium