What are halogens and chalcogens?
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The chalcogens are the name for the Periodic Table group 16 (or V1). Their compounds are referred to as "chalcogenides." These names became popular since they are analogous to the names of group 17(V11), halogens, meaning salt formers, and its compounds, halides.
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Chalcogens-any of the elements oxygen, sulfur, selenium, tellurium, and polonium, which form the VIa group in the periodic table.
Halogens-any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table
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