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Potassium and iodine are elements that comprise the compound potassium iodide (KI). Potassium is a soft, silvery white metal. Iodine is nearly black solid at room temperature and has crystalline appearance. Potassium iodide is a white crystalline salt which is most commonly used in photography and radiation treatment. 

Potassium iodide is a salt of stable iodine, whereas the potassium is white silvery, and soft metal. Iodine is the heaviest element of the halogens.

What is potassium iodide?

Potassium iodide is a chemical compound made up of potassium and iodine.

It is a dietary supplement and medication supplement.

It is a salt of non-radioactive slat of  iodine.

Potassium is a silvery white soft metal and iodine is a non-metallic solid  stable halogen.

Thus, Potassium iodide is a salt of stable iodine, whereas the potassium is white silvery, and soft metal. Iodine is the heaviest element of the halogens.

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