Topic: halogen

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halogen

The Columbia Encyclopedia, Sixth Edition
halogen [Gr.,=salt-bearing], any of the chemically active elements found in Group 17 of the periodic table ; the name applies especially to fluorine (symbol F), chlorine (Cl), bromine (Br), and iodine (I). Astatine (At), formerly known as alabamine, is a radioactive element also classed as a halogen; its most stable isotope (which does not occur in nature) has a half-life of less than 8 1/2 hr. The chemical and physical properties of astatine are not well known; it is believed to resemble iodine. The halogens are the best-defined family of chemical elements. Chemica... Read more
Halogens
Chemistry: Foundations and Applications Halogens The halogens are the family of chemical elements that includes fluorine (atomic symbol F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The halogens make up Group VIIA of the Periodic Table of the elements. Elemental ... Read more
Organic Halogen Compounds
Chemistry: Foundations and Applications Organic Halogen Compounds Organic halogen compounds are a large class of natural and synthetic chemicals that contain one or more halogens (fluorine, chlorine, bromine, or iodine) combined with carbon ... Read more

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