The chalogen containing equal number of 's' and ' $\mathrm{p}$ ' electrons is

Chalcogen are elements which belongs to oxygen family.

The elements of chalcogen group are as follows: oxygen, sulphur, selenium, tellurium, and polonium.

The electronic configuration of the elements are as follows:

$$\begin{gathered} \text{ Oxygen (O) -}8\left[\mathrm{He}\right]2{\mathrm{s}}^{2}2{\mathrm{p}}^4 \\ \text{ Sulphur (S) -}16\left[\mathrm{Ne}\right]3{\mathrm{s}}^{2}3{\mathrm{p}}^4 \\ \text{ Selenium (Se) -}34\left[\mathrm{Ar}\right]3{\mathrm{d}}^{10}4{\mathrm{s}}^{2}4{\mathrm{p}}^4 \\ \text{ Tellurium (Te) -}52\left[\mathrm{Kr}\right]4{\mathrm{d}}^{10}5{\mathrm{s}}^{2}5{\mathrm{p}}^4 \\ \text{ Polonium (Po) -}84\left[\mathrm{Xe}\right]4{\mathrm{f}}^{14}5{\mathrm{d}}^{10}6{\mathrm{s}}^{2}6{\mathrm{p}}^4 \end{gathered}$$

oxygen contains 4s and 4p electrons.