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noun
Any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions.
is a specific kind of: group, grouping.
is a broader term that covers: astatine, At, atomic number 85 | atomic number 35, Br, bromine | atomic number 17, chlorine, Cl | atomic number 9, F, fluorine | atomic number 53, I, iodin, iodine.
Dutch: halogeen
Find more on halogen elsewhere: etymology - rhymes - Wikipedia.
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