- any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals.
Origin of halogen
Examples from the Web for halogen
The light of halogen lamps is slightly more “whiteish” than incandescent lamps.The Light Bulb Is Dead. Long Live the Light Bulb!
December 20, 2013
The products in question have the characteristics of solid solutions of the halogen.Researches on Cellulose
C. F. Cross
It is decomposed by the halogen elements and also by sulphuretted hydrogen.
Halogens do not act directly on water, hence we may not properly speak of halogen substitution products.
Halogen, hal′o-jen, n. a substance which by combination with a metal forms a saline compound.
The halogen compounds of mercury, we should have mentioned, also sublime, the red iodide giving a yellow sublimate.
- any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions
Word Origin and History for halogen
general name for elements of the chlorine family, 1842, from Swedish, coined by Swedish chemist Baron Jöns Jakob Berzelius (1779-1848), literally "salt-producer," from Greek hals "salt" (see halo-) + -gen "giving birth to" (see -gen); so called because a salt is formed in reactions involving these four elements.
- Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.
- Any of a group of five nonmetallic elements with similar properties. The halogens are fluorine, chlorine, bromine, iodine, and astatine. Because they are missing an electron from their outermost shell, they react readily with most metals to form salts. See Periodic Table.