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The Roman numerals represent the oxidation number of the central metal atom/ion. The oxidation number of the metal atom and the oxidation numbers of the other ligands should add up to the overall charge on the coordination compound/ion.
Nawaphan Watanasirisuk 3B wrote:Is it possible to ever have a negative oxidation number? If so how would that be reflected in the name because there is no +/- sign in the brackets
Yes it is possible to have a negative oxidation number. To show that it is an anion, you would add -ate at the end of the central atom's name, and its Latin name will be used if it has one.
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