Definition of Halogen:

  1. Any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive nonmetallic elements that form strongly acidic compounds with hydrogen from which simple salts can be made.

  2. Member of the group of five chemicals, one of which (bromine) is a liquid, two (astatine and iodine) are solids, and other two (chlorine and fluorine) are gases. All of them are poisonous and extremely reactive (oxidizing agents), give off pungent and colored fumes, and are classified as non-metals. See also halon.

How to use Halogen in a sentence?

  1. For many syntheses, this means using such compounds as hydrocarbons and alcohols, plus inorganic acids, metals, halogens, or other compounds.

Meaning of Halogen & Halogen Definition