Chemistry - Complete d-block Question with Solution | TestHub

Electronic Configuration is the distribution of electrons in the various available orbitals of an atom of an element. 

The mentioned elements are present in d-block.

$\left[\mathrm{Cr}\right]=\left[\mathrm{Ar}\right]4 {\mathrm{s}}^{1}3 {\mathrm{d}}^5$

$\left[\mathrm{Cd}\right]=\left[\mathrm{Kr}\right]5 {\mathrm{s}}^{2}4 {\mathrm{d}}^{10}$

$\left[\mathrm{Cu}\right]=\left[\mathrm{Ar}\right]4 {\mathrm{s}}^{1}3 {\mathrm{d}}^{10}$

$\left[\mathrm{Ag}\right]=\left[\mathrm{Kr}\right]5 {\mathrm{s}}^{1}4 {\mathrm{d}}^{10}$

$\left[\mathrm{Zn}\right]=\left[\mathrm{Ar}\right]4 {\mathrm{s}}^{2}3 {\mathrm{d}}^{10}$

Hence, the answer is B.