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The ion for Potassium has a charge of 1+.

The ion for Iodine has a charge of 1-.

This means that in order to make the overall charge of a unit of a compound of Potassium and Iodine, there must be one atom of Potassium and one atom of Iodine.

Therefore, when K+ and I- are bonded, they make the ionic compound of KI.

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Q: What is the formula for the ionic compound K plus and I?
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