what is halogen?????????????
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The halogens are a group in the periodic table consisting of five chemically related elements: fluorine, chlorine, bromine, iodine (I), and astatine. The artificially created element 117, tennessine, may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17.
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any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive non-metallic elements that form strongly acidic compounds with hydrogen from which simple salts can be made.
denoting lamps and radiant heat sources using a filament surrounded by the vapour of iodine or another halogen.
modifier noun: halogen
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