Question:
In which of the following pairs, the outer most electronic configuration will be the same?
Correct Option: 1,
Solution:
Option $-1 \quad \mathrm{Mn}^{+2}[\mathrm{Ar}] 3 \mathrm{~d}^{5}, \mathrm{Cr}^{+}[\mathrm{Ar}] 3 \mathrm{~d}^{5}$
Option $-2 \quad \mathrm{Ni}^{+2}[\mathrm{Ar}] 3 \mathrm{~d}^{8}, \mathrm{Cu}^{+}[\mathrm{Ar}] 3 \mathrm{~d}^{10}$
Option $-3$$\mathrm{Fe}^{+2}[\mathrm{Ar}] 3 \mathrm{~d}^{6}, \mathrm{Co}^{+}[\mathrm{Ar}] 3 \mathrm{~d}^{7} 4 \mathrm{~s}^{1}$
Option $-4 \quad \mathrm{~V}^{+2}[\mathrm{Ar}] 3 \mathrm{~d}^{3}, \mathrm{Cr}^{+}[\mathrm{Ar}] 3 \mathrm{~d}^{5}$
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