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QUESTION
What are the cations and anions for the formula CuBr2?
Cation = ##Cu^(2+)## Anion = ##Br^-##
Bromine is a halogen (group 7A, or Group 17 using IUPAC). Halide ions will have a -1 charge.
You can use the charge of the bromide ion to deduce the charge of the copper cation. Since must be electrically neutral, the copper must have a charge of +2 since there are two -1 bromide ions.
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