Question
Question: Which of the following has the maximum number of unpaired d-electron?...
Which of the following has the maximum number of unpaired d-electron?
A
Zn2+
B
Fe2+
C
Ni2+
D
Cu2+
Answer
Fe2+
Explanation
Solution
30Zn [Ar]18 3d10, so n = 0, Fe2+ [Ar]18 3d6, so n = 4 ; Ni2+ [Ar]18 3d8, so n = 2 ; Cu2+ [Ar]18 3d9, so n = 1.