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Halogens (Rbcebh)

Definition
Any of five related nonmetallic elements (fluorine, chlorine, bromine, iodine or astatine) that are all monovalent and readily form negative ions. (Source: wordnet.princeton.edu)
Broader Term
Classes of chemical elements (Rbceb)
Related Terms (Hierarchical)
Alkali metals (Rbcebb)
Nonmetals (Rbcebn)
Trace elements (Rbcebr)
Transuranium elements (Rbcebt)