The number of isoelectronic species among Sc^3+, Cr^2+, Mn^3+, Co^3+ and Fe^3+ is ' n '. If ' n ' moles of AgCl is formed during the reaction of…

The number of isoelectronic species among $\displaystyle \mathrm{Sc}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Mn}^{3+}, \mathrm{Co}^{3+}$ and $\displaystyle \mathrm{Fe}^{3+}$ is ' n '. If ' n ' moles of AgCl is formed during the reaction of complex with formula $\displaystyle \mathrm{CoCl}_3(\mathrm{en})_2 \mathrm{NH}_3$ with excess of $\displaystyle \mathrm{AgNO}_3$ solution, then the number of electrons present in the $\displaystyle \mathrm{t}_{2 \mathrm{~g}}$ orbital of the complex is $\displaystyle \_\_\_\_$.