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Meaning of chalcogen

chal•co•gen

Pronunciation: (kal'ku-jun, -jen"), [key]
— n.
  1. any of the elements oxygen, sulfur, selenium, tellurium, and polonium, which form the VIa group in the periodic table.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.