Iodine is a chemical element with symbol I and atomic number 53. The name is from Greek ??????? ioeid?s, meaning violet or purple, referring to the color of iodine vapor.

Iodine and its compounds are primarily used in nutrition, and industrially in the production of acetic acid and certain polymers. Iodine's relatively high atomic number, low toxicity, and ease of attachment to organic compounds have made iodine radioisotopes, such as 131I, a part of many X-ray contrast materials in modern medicine. Iodine has only one stable isotope. Wikipedia, Iodine

See Also

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Table of the Elements - Russell Elements