Week 9 Achieve #2 Coordination Number

[Joan Moci 1J]

For the question how do I find the coordination number of a compound? For example the question asks for the coordination number of K3[CoF6]. I think the number should be 3 but the question keeps saying that I have not correctly determined it. What am I missing?

[Mari Masunaga 1G]

Hi! coordination number is determined by the species inside the brackets. So in your case I think the coordination number should be 6 instead of three since there are 6 F binding to one Co.

[Anne Hogue 2J]

In order to find the coordination number, you must count how many ligands are bonded to thee central atom. So for your question, K3[CoF6], the coordination number would be 6 because there are 6 fluoro ligands bonded to the central atom, Co.

[Kurosh Zamiri 1I]

Hi! In the case of K3[CoF6], to find the coordination number we look at the ligands that are bound to the central transition metal. Since K3 is outside the brackets, we disregard this when referring to the coordination number. The central atom is Co, and it has 6 fluorine atoms surrounding it. Therefore, the coordination number is equal to the amount of ligands, which is 6. Hope this helps!

[Jiane_Beach_1D]

To find the coordination number you just count how many ligands are attached to the central atom, usually a transition metal. In this case there are 6 F attached to the Co so the coordination number is 6. If you are ever stuck it can help to draw or visualize it somehow.

[805757847]

For me I count how many ligands are connected to cation. Some special occasions are "en" and "EDTA." en is counted as 2 and EDTA as 6.

[Kathryn Heinemeier 3H]

It would be 6 because it's determined by the number of ligands inside the brackets so since Co is the transition metal and F is the ligand and there's 6 of them the coordination number would be 6.

[Bailey Wallace 3A]

If there is a transition metal is it always the central atom?

[KatieWu 1E]

The central atom is usually the transition metal so in this case it's Co. Co has 6 F attached to it so the coordination number would be 6.

[Anish_Marripati_2F]

You need to look at the number of atoms attached to the central atom inside the bracket. In this case it's 6 since there are 6 F.

[205686400]

Hi! The coordination number is equivalent to the number of bonds that the central atom forms, so when given the molecular formula you should pay more attention to what's inside the brackets. You don't have to look at the central atom just what's attached to it.