Electron configuration for Chromium (element 24). Orbital diagram

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Cr (Chromium) is an element with position number 24 in the periodic table. Located in the IV period. Melting point: 1857 ℃. Density: 7.14 g/cm³.

The order of filling the orbitals with electrons in the Cr atom is an exception to the rule.
Expected electronic configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴
But in reality, one electron moves from the 4s orbital to the 3d orbital:

Electronic configuration of the Chromium atom in ascending order of orbital energies:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵

Electronic configuration of the Chromium atom in ascending order of the levels:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹

Reduced electronic configuration Cr:
[Ar] 3d⁵ 4s¹

Below is the electronic diagram of the Chromium atom

Distribution of electrons over energy levels in the Cr atom
1-st level (K): 2
2-st level (L): 8
3-st level (M): 13
4-st level (N): 1

Distribution of electrons in the Chromium

Valence electrons of Chromium

The number of valence electrons in a Chromium atom - 6.
Below are their quantum numbers (N - energy, L - angular momentum, M - magnetic moment, S - spin )

Orbital	N	L	M	S
s	4	0	0	+1/2
d	3	2	-2	+1/2
d	3	2	-1	+1/2
d	3	2	0	+1/2
d	3	2	1	+1/2
d	3	2	2	+1/2

Oxidation states of Chromium: +1, +2, +3, +4, +5, +6

Other elements

Electronic configurations of other elements

Vanadium (V) electron configuration
Manganese (Mn) electron configuration
Electronic configuration table

Chromium electron configuration

Valence electrons of Chromium

Electronic configurations of other elements