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  • Tube of iodine in a beaker showing purple color of its vapor
    Rights: Pierre Joliveau Published 17 September 2009 Size: 55 KB Referencing Hub media

    Iodine, a solid at room temperature, is element number 53 on the periodic table. When gently heated it sublimes into a purple vapour as seen here. Iodine is an essential element in the diet, too little can result in the medical condition goitre. Using iodised salt is one way of making it available to the body.

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