Elemental halogens are dangerously to potentially lethally toxic. Organobromides are the most important class of flame retardants. The middle halogen, that is chlorine, bromine and iodine, are often used as disinfectants. Most halogens are typically produced from minerals or salts. All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1.Īll of the halogens form acids when bonded to hydrogen. The term “halogen” means “salt-former” and compounds containing halogens are called “salts”. The symbol X is often used generically to refer to any halogen. In the modern IUPAC nomenclature, this group is known as group 17. The artificially created element 117 (tennessine, Ts) may also be a halogen. The halogens are fluorine, chlorine, bromine, iodine, and astatine. ![]() Halogens (or halogen elements) are any of a group of five nonmetallic elements with similar properties.
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