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It is soluble in water and dissolves easily in chloroform, carbon tetrachloride, or carbon disulfide to form bright violet solutions. It also exhibits some properties of metal. Iodine vapor is irritating to the eyes and can bother the skin. Thirty isotopes of iodine are known, however, only one isotope is natural.

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Photography was the first commercial use for iodine after Louis Daguerre invented images called daguerreotypes.Today, iodine has many commercial uses. Iodide salts are used in pharmaceuticals and disinfectants, printing inks and dyes, catalysts, animal feed supplements and photographic chemicals. Iodide is added in small amounts to table salt to help avoid iodide deficiency.

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In 1811, iodine was discovered by French chemist Bernerd Courtois. the name Iodine was suggested because iode is the latin work meaning violet gas. Iodine is the fourth halogen below fluorine, chlorine, and bromine; it is the heaviest  member of its group. Though it is the least reactive of the halogens, iodine is still one of the more reactive elements.

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Iodine is found in thyroid hormones and iodine deficiency affects about two billion people and is the leading preventable cause of many disabilities.

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Iodine is found in the thyroid and iodide deficiency affects about two billion people and is the leading preventable cause of many disabilities.

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Iodine is the heaviest of the halogens and exists as a purple-black metallic solid at a standard conditions that sublimes  to form a violet gas.

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Iodine is 53 on the periodic table and has the atomic weight of 126.9045.