halogen Hear it!

halogen definition

halo·gen (hal′ə jən)

noun

any of the five very reactive, nonmetallic chemical elements making up group VIIA of the periodic table: fluorine is the smallest and most reactive of the group, and astatine is the largest and least reactive

Etymology: halo- + -gen

Related Forms:

  • halogenous ha·log′·enous (ha lä′jə nəs) adjective

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