Chemistry - Complete d-block Question with Solution | TestHub

The atomic number 25 corresponds to Manganese (Mn).

The electronic configuration of Mn is $[Ar]3d^{5}4s^2$.

For a divalent ion (Mn²⁺), two electrons are removed from the 4s orbital.

The electronic configuration of Mn²⁺ is $[Ar]3d^5$.

Number of unpaired electrons, $n=5$.

Magnetic moment, $\mu =\sqrt{n(n+2)}$ BM

$\mu =\sqrt{5(5+2)}=\sqrt{5\times 7}=\sqrt{35}$ BM

$\mu \approx 5.92$ BM

The final answer is $\boxed{5.92BM}$.