Cu2+ + I- --> Cu2I
The compound created is Copper(I) Iodide
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im not sure that is possible what you are saying is that 63- I have never seen this in my 8 years since first taking algebra. the negative sign outside the exponent can mean a negative charge on chemistry. lets say you have a copper ion... copper = Cu2- this means is has two extra electrons that it wants to share
Typically use use the Roman numeral with a metal after a metal in an ionic compound to indicate which ion is indicated in the compound. The reason for this is that many metals can form more than one kind of ion. For example, copper can form Cu+ ions or Cu2+ ions, and iron can form Fe2+ ions and Fe3+ ions.