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US Pharm. 2011;36(6):HS-25-HS-28. Potassium iodide (KI) is an inorganic compound that is available from three manufacturers under different brand names as an antidote to radiation exposure. From a chemistry point of view, it is made from potassium hydroxide and iodine, and it is the most produced iodide compound in the world.
Ernest Z. Potassium iodide is an ionic compound. Potassium is in Group 1 of the Periodic Table. That means it is a metal. Iodine is in Group 17 of the Periodic Table. That means it is a nonmetal. Metals react with nonmetals to form ionic compounds. A sodium atom transfers an electron to a chlorine atom to form a sodium ion and a chloride ion. The product is the ionic compound, sodium chloride. In the same way, a potassium atom transfers an electron to an iodine atom to form a potassium ion and an iodide ion. So, potassium iodide is an ionic compound.