What is meant by "Halogen"?
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halogen is a chemical element that forms a salt when it reacts with metal. ... There are five halogens in the periodic table of chemical elements: fluorine, chlorine, bromine, iodine, and astatine. The halogens are all highly reactive, which means they're quick to form bonds with other elements.
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any of five chemical substances that are not metals and that combine with hydrogen to form strong acid compounds from which simple salts can be made
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