Which of the following electronic configuration is associated with the highest stable oxidation state?

[A r] {3 d}^{1} {4 s}^{2}

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[A r] {3 d}^{5} {4 s}^{1}

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[A r] {3 d}^{5} {4 s}^{2}

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[A r] {3 d}^{6} {4 s}^{2}

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Solution

The correct option is C $[A r] {3 d}^{5} {4 s}^{2}$
Half filled and completely filled d and s orbitals are extra stable.
In the electronic configuration, $[A r] {3 d}^{5} {4 s}^{2}$ , the 3d orbital is half filled and 4s orbital is completely filled.
Hence, this electronic configuration has highest stability.

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X

+ 3

[A r] 3 d^{5}

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