Question

Consider the following ions

$1.$ $N{i}^{2+}$

$2.$ $C{o}^{2+}$

$3.$ $C{r}^{2+}$

$4.$ $F{e}^{3+}$

Atomic number: Cr = 24, Fe = 26, Co = 27, Ni = 28.

The correct sequence of increasing order of the number of unpaired electrons in these ions is

• A. 1, 2, 3, 4
• B. 4, 2, 3, 1
• C. 1, 3, 2, 4
• D. 3, 4, 2, 1

Answer 1

Answer: (A)