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An ionic compound is always electrically neutral. The positive charges of the cations are exactly cancelled by the negative charges on the anions. There is a mathematical way of showing this but perhaps simple example's are better.

Some examples

Cation ..Anion ..Ratio Example

+1 ..........-1....... 1:1 ..NaCl

+2 ..........-1 ......1:2 ..CaCl2

+2 ...........-2..... 1:1 ...CaO

+3 ...........-2 .....2:3 ..Fe2O3

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Q: How do you decide how many ions of each type combine to form an ionic compound?
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