Electron configuration for Platinum (element 78). Orbital diagram

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Pt (Platinum) is an element with position number 78 in the periodic table. Located in the VI period. Melting point: 1772 ℃. Density: 21.45 g/cm³.

The order of filling the orbitals with electrons in the Pt atom is an exception to the rule.
Expected electronic configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁸
But in reality, one electron moves from the 6s orbital to the 5d orbital:

Electronic configuration of the Platinum atom in ascending order of orbital energies:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s¹ 4f¹⁴ 5d⁹

Electronic configuration of the Platinum atom in ascending order of the levels:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁹ 6s¹

Reduced electronic configuration Pt:
[Xe] 4f¹⁴ 5d⁹ 6s¹

Below is the electronic diagram of the Platinum atom

Distribution of electrons over energy levels in the Pt atom
1-st level (K): 2
2-st level (L): 8
3-st level (M): 18
4-st level (N): 32
5-st level (O): 17
6-st level (P): 1

Distribution of electrons in the Platinum

Valence electrons of Platinum

The number of valence electrons in a Platinum atom - 10.
Below are their quantum numbers (N - energy, L - angular momentum, M - magnetic moment, S - spin )

Orbital	N	L	M	S
s	6	0	0	+1/2
d	5	2	-2	+1/2
d	5	2	-1	+1/2
d	5	2	0	+1/2
d	5	2	1	+1/2
d	5	2	2	+1/2
d	5	2	-2	-1/2
d	5	2	-1	-1/2
d	5	2	0	-1/2
d	5	2	1	-1/2

Oxidation states of Platinum: +2, +4, +5, +6

Other elements

Electronic configurations of other elements

Iridium (Ir) electron configuration
Gold (Au) electron configuration
Electronic configuration table

Platinum electron configuration

Valence electrons of Platinum

Electronic configurations of other elements