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Hi, here is a helpful definition that I found on coordination numbers: "Coordination number, also called Ligancy, the number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbors in a complex or coordination compound or in a crystal" (Britannica). Hope this helps!
Coordination number is the number of atoms or molecules that is currently surrounded by a central atom. For example the coordination number of [M(NH3)4 F2] is 6 because there are 6 bonded regions to the central atom (M).
Coordination number is the number of bonds on the transition metal cation within the coordination compound. It is important to note that a single ligand can contribute to more than one coordination number if it is polydentate. For instance, a bidentate ligand, such as ethylenediamine, would be able to form a ring like structure and have two bonds with the transition metal cation. Therefore, a bidentate ligand would contribute 2 to the overall coordination number as it forms 2 bonds.
I have found a pattern in simply looking at the subscripts of the ligands and adding those up and using that as the coordination number. I don't know if this is an effective method or not, or if it's already widely used, but just thought I would throw it out there in case it helped someone!
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