Iodine, non-metallic element

Iodine, non-metallic element

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Caption: Iodine, a violet-black, non-metallic element belonging to the halogen group of the periodic table. Iodine is present in seawater and was formerly extracted from seaweed; it is now obtained from oil-well brines. Iodine is required as a trace element by most living organisms. In mammals it is concentrated in the thyroid gland as a constituent of thyroid hormones. Tincture of iodine (iodine dissolved in ethanol) is used in medicine as a mild antiseptic. There is one stable isotope (iodine-127) and 14 radioactive isotopes. Iodine has the chemical symbol I and was discovered in 1812 by Courtois.

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Keywords: chemical, chemistry, element, elements, iodine

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