Step-by-step explanation:
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When we unite potassium, which has a valence number of +1, that means that it has da electron, we unite it with iodine, which has a valence number of -1. That is, the iodine accepts an electron.
We form potassium iodide.
The formula is:
K + I ---> KI
It is a balanced equation since it uses one atom of each (iodine and potassium) for the formation of the product.