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 complex with formula CoCl ₃( en )₂ NH ₃ with excess of AgNO ₃ solution, then the number of electrons present in the t_ 2 g orbital of the complex is _ _ _ _ .

Step-by-step solution

For the complex CoCl₃(en)₂NH₃, cobalt is in +3 oxidation state with electron configuration [Ar]3d⁶. In an octahedral field with strong field ligands (ethylenediamine, ammonia, chloride), Co³⁺ forms a low-spin complex with t_ 2g ^6 e_g^0 configuration. The t_ 2g orbitals consist of d_ xy , d_ xz , and d_ yz . With all 6 electrons filling the three t_ 2g orbitals, the total number of electrons in the t_ 2g orbital set is 6.