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  4. The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr3+ ion is

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Q. The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of $Cr^{3+}$ ion is

The d-and f-Block Elements

Solution:

$Cr\left(24\right) : 3d^{5}4s^{1}$
$Cr^{3+} : 3d^{3}$
$\mu = \sqrt{n\left(n+2\right)}=\sqrt{3\left(3+2\right)}$
$= \sqrt{15} = 3.87\,B.M.$