Question

The number of unpaired electrons in ferrous ion(Z = 26) is

• A. 3
• B. 2
• C. 4
• D. 5

Answer 1

Answer: (C)

Fe(Z = 26) : $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^2$
$F{e}^{2+}$ (ferrous ion) : $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^6$
Number of unpaired electrons = 4.