why are the elements chlorine bromine and iodine called halogen?
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The group 7 elements are also known as the halogens. They include fluorine,chlorine, bromine and iodine, which all have seven electrons in their outer shell. In a displacement reaction, a less reactive element is displaced by a more reactive element.
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Halogen means salt forming so the elements F, Cl ,Br and I are called halogens because they form salts.
Such as:- NaCl or most of the soluble salts i.e. Chlorides , Bromides and iodides etc. in the sea water .
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