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What is an atom for halogen

User Ronkov
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Halogen is one of the Noble Gases in the periodic table. The five poisons create Group 17 of the periodic table. Which are Fluorine, chlorine, bromine, iodine and astatine.
User Danchoys
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Halogens are a family of atoms (the penultimate column of the periodic table). They're composed of Fluorine, Bromine, Chloride, Iodine and Astatine.
User Jimm
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