The correct name for the chemical compound containing potassium and iodine is potassium iodide. The endings of the names of non-metals is changed to -ide in compound.
Potassium iodide is an ionic compound with the formula KI. It's electrically neutral because it has equal amounts of positive and negative charge. Potassium forms a +1 ion and iodine forms a -1 ion, so the formula KI has a net charge of zero. (+1 + -1 = 0)
Chemical compounds are always neutral. Ions form compounds by combining in ratios that equalize the postive and negative charge. For example, the formula of magnesium iodide is MgI2. The magnesium ion has two positive charges so it combines with iodine in a ratio of 2 to 1, resulting in a net charge of zero.
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