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Iodine (from the Gr. Iodes, meaning violet), is a chemical element in the periodic table that has the symbol I and atomic number 53. It is required as a trace element for most living organisms. Chemically, iodine is the least reactive of the halogens, and the most electropositive halogen. Iodine is primarily used in medicine, photography and in dyes. As with all other halogens (members of Group VII in the Periodic Table), iodine is found as diatomic molecules, and hence, has the molecular formula of I2.
Dietary intake
The United States Food and Drug Administration recommends (21 CFR 101.9 (c)(8)(iv)) 150 micrograms of iodine per day for both men and women.
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