Question
Question: Which of the following ions has the maximum number of unpaired d-electrons?...
Which of the following ions has the maximum number of unpaired d-electrons?
A
Zn2+
B
Fe2+
C
Ni3+
D
Cu+
Answer
Fe2+
Explanation
Solution
Zn2+ : [Ar] 3d10 (0 unpaired electrons).
Fe2+ : [Ar] 3d6 (4 unpaired electrons)
maximum.
Ni3+ : [Ar] 3d7 (3 unpaired electrons).
Cu+ : [Ar] 3d10 (0 unpaired electrons).