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When finding the oxidation number of a transition metal in a coordination compound, the book says you need you subtract the charge of each ligand present from the overall charge. How do we know which ligands have what charge, or if they have a charge at all? Thanks!
You could figure out the charge of the ligands using the periodic table. For example nitrogen would have a -5 charge when it's considered as an ion, while Carbon has a +4 charge. So the ligand CN would have a total -1 charge. For common compounds such as H20, NH3, and CN-, it is better to memorize them, but you could still figure out the charge using the same method.
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