Coordination Compounds Part 4

The number of isoelectronic species among Sc3+,Cr2+,Mn3+,Co3+ and Fe3+ is ' n '. If ' n ' moles of AgCl is formed during the reaction of complex with formula CoCl3(en)2NH3 with excess of AgNO3 solution, then the number of electrons present in the t2g orbital of the complex is ____ .