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To calculate the oxidation number of the metal in the compound first you must look at the other elements and compounds that are attached to it and determine its charge from there. For example, in [CoCl(NH3)5]Cl2, you are expected to know that Cl has a charge of -1 and NH3 has a charge of 0. Since there are 3 Cl, there is a negative charge of -3. Because the net charge of the coordination compound is 0, the Co must have a charge of +3 making it cobalt(III).
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