Question

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

• A. 3
• B. 5
• C. 6
• D. 4

Answer 1

Answer: (A)

3

Answer 2

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