Question
$Mn ^{2+}, Fe ^{3+}$ have high magnetic moment. Prove it.

Answer

1. $Mn ^{2+}, Fe ^{3+}$ configuration is $d ^5$.
2. $\mu=\sqrt{5(5+2)}=\sqrt{35}=5.916 \mu_{ B }$
Among $3 d$ series, $Mn ^{2+}, Fe ^{3+}$ have high magnetic moment as $5.916 \mu_{ B }$.

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