Why are halogens represented by the symbol X?
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It's a particular symbol alphabet given to halogens representing this group.
Halogens contain Chlorine, Fluorine, Iodine, Bromine etc.... Means which have valency ( - 1) and are of 17th group elements.
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For halogenation of olefins, we would thus write , In general X=Cl,Br .Iodine tends to be a little bit expensive. Fluorine chemistry is the preserve of specialists, because the F2 is extremely and dangerously reactive.
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