These crystals of lead iodide formed from a mixture of lead nitrate and potassium iodide. Yiping Zhang, of Xiamen University prepared the fine, flaky crystals by mixing the reagents in boiling water ...

Potassium iodide is a salt made up of the minerals potassium (K) and iodine (I). Its chemical formula is “KI.” Potassium iodide is a medication and, when used properly, it can help protect the thyroid ...