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  4. The magnetic moment of a divalent ion in aqueous solution with atomic number 25 is

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Q. The magnetic moment of a divalent ion in aqueous solution with atomic number $25$ is

The d-and f-Block Elements

Solution:

$\mu = \sqrt{n\left(n+2\right)}\,B.M.$
Electronic configuration of ion $\left(25\right)$
$= 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^{2}$
No. of unpaired electrons $\left(n\right) = 5$
$\mu = \sqrt{5\left(5+2\right)} = \sqrt{35} = 5.9\,B.M.$