Question

How many unpaired electrons are there in $N{i}^{2+}$ (Z = 28) ?

• A. 0
• B. 8
• C. 2
• D. 4

Answer 1

Answer: (C)

2

Nickel has two unpaired electrons in the $3d$ sublevel. When nickel ionizes to the $+2$ state it loses the two electrons in the $4s$, so there are still two unpaired electrons in $N{i}^{2+}$.