Question: In which of the following pairs, the outer most electronic configuration will be the same?
$\mathrm{Fe}^{2+}$ and $\mathrm{Co}^{+}$
$\mathrm{Cr}^{+}$and $\mathrm{Mn}^{2+}$
$\mathrm{Ni}^{2+}$ and $\mathrm{Cu}^{+}$
$\mathrm{V}^{2+}$ and $\mathrm{Cr}^{+}$
Correct Option: , 2
Solution:
$\mathrm{Cr}^{+} \rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^{5}$
$\mathrm{Mn}^{2+} \Rightarrow[\mathrm{Ar}] 3 \mathrm{~d}^{5}$
