Halogens are the elements fluorine, chlorine, bromine, iodine, astatine; these form group seven (VIIA) of the periodic table. They are all non-metals and strongly electronegative.

Some generalistic trends among the halogens. As you go down the group -

Halogens are all non-metals with coloured vapours. Halogens are poisonous. They all form molecules which are pairs of atoms, and will form both ionic and covalent bonds.

Hal"o*gen (?), n. [Gr. "a`ls, "alo`s, salt + -gen: cf. F. halogene.] Chem.

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

 

© Webster 1913.

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