Electron configuration for Molybdenum (element 42). Orbital diagram

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Mo (Molybdenum) is an element with position number 42 in the periodic table. Located in the V period. Melting point: 2617 ℃. Density: 10.28 g/cm³.

The order of filling the orbitals with electrons in the Mo atom is an exception to the rule.
Expected electronic configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁴
But in reality, one electron moves from the 5s orbital to the 4d orbital:

Electronic configuration of the Molybdenum atom in ascending order of orbital energies:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹ 4d⁵

Electronic configuration of the Molybdenum atom in ascending order of the levels:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s¹

Reduced electronic configuration Mo:
[Kr] 4d⁵ 5s¹

Below is the electronic diagram of the Molybdenum atom

Distribution of electrons over energy levels in the Mo atom
1-st level (K): 2
2-st level (L): 8
3-st level (M): 18
4-st level (N): 13
5-st level (O): 1

Distribution of electrons in the Molybdenum

Valence electrons of Molybdenum

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

Orbital	N	L	M	S
s	5	0	0	+1/2
d	4	2	-2	+1/2
d	4	2	-1	+1/2
d	4	2	0	+1/2
d	4	2	1	+1/2
d	4	2	2	+1/2

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

Other elements

Electronic configurations of other elements

Niobium (Nb) electron configuration
Technetium (Tc) electron configuration
Electronic configuration table

Molybdenum electron configuration

Valence electrons of Molybdenum

Electronic configurations of other elements