Question

Number of unpaired electrons in $M{n}^{4+}$ is :

• A. 3
• B. 5
• C. 6
• D. 4

Answer 1

Answer: (A)

Write the electronic configuration of $Mn$ in ground state then
$M{n}^{4+}$
Draw the orbitals to find unpaired electrons.
$Mn-(At.no.=25)$
$=1s^2,2s^2,2p^6,3s^2,3p^6,4s^{2}3d^5$
$\therefore M{n}^{4+}1s^2,2s^2,2p^6,3s^2,3p^6,4s^0,3d^3$
$\therefore M{n}^{4+}$ has three unpaired electrons.