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Hund's Rule

The number of...

Question

The number of unpaired electrons in $M n^{4 +}$ (Z=25) is

A

Four

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B

Two

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C

Five

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D

Three

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Solution

The correct option is D Three
$M n^{4 +}$ has electronic configuration $[A r] 3 d^{3}$
The three d electrons will be unpaired according to Hund's rule of maximum multiplicity.
Hence, number of unpaired electrons in $M n^{4 +}$ (Z=25) is 3

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