Question

Which is the correct order of increasing number of unpaired electrons in the following ions?
\( A = \text{Cr}^{2+} \, (Z = 24), \quad B = \text{Cu}^{2+} \, (Z = 29), \quad C = \text{Ni}^{2+} \, (Z = 28), \quad D = \text{Fe}^{3+} \, (Z = 26) \)

• A. B < C < A < D
• B. D < C < A < B
• C. B < C < D < A
• D. C < B < D < A

Hint:

To determine the number of unpaired electrons, write the electron configuration and count the unpaired electrons in the highest energy orbitals.

Answer 1

The Correct Option is A