UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈkælkəˌdʒɛn/US:USA pronunciation: respellingUSA pronunciation: respelling(kalkə jən, -jen′)

WordReference Random House Unabridged Dictionary of American English © 2020
chal•co•gen  (kalkə jən, -jen′),USA pronunciation n. 
  1. Chemistryany of the elements oxygen, sulfur, selenium, tellurium, and polonium, which form the VIa group in the periodic table.
  • chalcho- + -gen 1960–65

Collins Concise English Dictionary © HarperCollins Publishers::
chalcogen /ˈkælkəˌdʒɛn/ n
  1. any of the elements oxygen, sulphur, selenium, tellurium, or polonium, of group 6A of the periodic table
Etymology: 20th Century: from chalco( pyrite) + -gen
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