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n. Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.

n. Any element of group 7, i.e. fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal.

n. An electro-negative element or radical, which, by combination with a metal, forms a haloid salt; especially, chlorine, fluorine, bromine, and iodine; sometimes, also cyanogen. See Chlorine family, under chlorine.

n. In chem., an element that forms a compound of a saline nature by its direct union with a metal.

n. any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions

"All the halogen is obtained with the washing liquid in the form of sodium halide, all the sulphur in the form of sulphuric acid."

grouping    group   

quartz halogen lamp    halide   

chlorine   

f    chlorine    iodin    atomic number 35    atomic number 85    at    bromine    astatine    Br    atomic number 17   

xenon    tungsten    acetylene    mercury-vapor    anbaric    ultraviolet    full-spectrum    green-shaded    40-watt    fluorescent