Which response gives the correct coordination number (C. N.) and oxidation number (O. N.) of the transition metal atom in [Co(NH3)2(H2O)2Cl2]

The question is incomplete; the complete question is;

Which response gives the correct coordination number (C.N.) and oxidation number (O.N.) of the transition metal atom in [Co(NH3)2(H2O)2Cl2]+? a. C.N. = 2, O.N. = +3 b. C.N. = 3, O.N. = +1 c. C.N. = 4, O.N. = +2 d. C.N. = 6, O.N. = +1 e. C.N. = 6, O.N. = +3

C.N. = 6, O.N. = +1

Explanation:

Now let us look at the coordination compound again. Its formula is;

[Co(NH3)2(H2O)2Cl2]+

We can see that there are six ligands in the coordination sphere of the compound. Remember that the coordination number or secondary valency of a coordination compound refers to the the number of ligands in its coordination sphere.

Secondly the oxidation number of the metal or its primary valency is the charge written outside the coordination sphere.