Total number of unpaired electrons in the complex ions ( [ Co ( NH ₃ )₆ ]³⁺ ) and ( [ NiCl ₄ ]²⁻ ) is ( )

Step-by-step solution

aligned & Co ⁺³: 3 ~d ^6 t _ 2 ~g ^ 2,2,2 e _ g ^ 0,0 & Unpaired e e ⁻=0 & Ni ⁺²: 3 ~d ^8 e ^ 2,2 t ₂^ 2,1,1 & Unpaired e ⁻=2 aligned