Question

The spin only magnetic moment of ${\mathrm{Mn}}^{4+}$ is:

• A. $3\mathrm{BM}$
• B. $5\mathrm{BM}$
• C. $4\mathrm{BM}$
• D. $6\mathrm{BM}$

Answer 1

The correct option is C

$4\mathrm{BM}$

Explanation for the correct option:

(c ) $4\mathrm{BM}$

• ${\mathrm{Mn}}^{4+}=\left[\mathrm{Ar}\right]3{\mathrm{d}}^3$
• Where, $\mathrm{n}=3$(n = no of electrons in valence shell)
• $\begin{array}{l}(\mathrm{Magnetic}\mathrm{moment}){\mu }_s=\sqrt{n(n+2)}\\ \Rightarrow \sqrt{3(3+2)}\\ \Rightarrow \sqrt{3\left(5\right)}\\ \Rightarrow \sqrt{15}\\ \Rightarrow 3.87\approx 4BM\end{array}$
• So magnetic moment is $4\mathrm{BM}$
• Hence this option is correct.

Hence the correct option is (c ) $4\mathrm{BM}$