C3H4A1L1C3O1G2E1N1S1
18 points
CHALCOGENS is validvalid
CHALCOGEN, a chemical element in the sixteenth group of the periodic table [n]
CHALCOGEN, an element from group VI(B) of the periodic table, namely sulphur, selenium or tellurium [n]
CHALCOGEN, a chemical element in the sixteenth group of the periodic table [n]
CHALCOGEN, an element from group VI(B) of the periodic table, namely sulphur, selenium or tellurium [n]