Question

Find the coordination number of the central metal atom in [Co(NH₃)₅Cl]Cl₂.

Answer 1

Complex ion: [Co(NH₃)₅Cl]Cl₂

Ligands inside the coordination sphere are

5 NH₃ (ammonia molecules)

1 Cl⁻ (chloride ion)

Coordination Number = 5(NH₃) + 1(Cl⁻)

= 6