What is the coordination number of the central Cobalt ion in the complex [Co(NH3)6]Cl3?
Answer and explanation
Correct answer: A. 6
- Step 1: Coordination number is the total number of ligand donor atoms directly bonded to the central metal ion by coordinate covalent bonds. Step 2. Six monodentate ammonia ligands coordinate to Co3+, giving coordination number 6. Answer: 6. Why not the others: 3 is the number of ionizable chloride counter-ions outside coordination sphere; 9 sums ligands and counter-ions; 4 is for tetrahedral/square planar.
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