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18 points
CHALCOGENS is validvalid
CHALCOGEN, a chemical element in the sixteenth group of the periodic table
CHALCOGEN, an element from group VI(B) of the periodic table, namely sulphur, selenium or tellurium
CHALCOGEN, a chemical element in the sixteenth group of the periodic table
CHALCOGEN, an element from group VI(B) of the periodic table, namely sulphur, selenium or tellurium