Question

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

• A. 3
• B. 2
• C. 4
• D. 5

Answer 1

Answer: (C)

4

Answer 2

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