Synset

any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
<noun.substance> freq. cnt.: 2 freq. cnt.: 2

semantic pointers

hypernym

group, grouping

hyponym

astatine, At, atomic number 85 bromine, Br, atomic number 35 chlorine, Cl, atomic number 17 fluorine, F, atomic number 9 iodine, iodin, I, atomic number 53