Assertion: hafnium's number | /r/HasProperty | hf hypernyms
Facets:
Source sentences:
text: A grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons Classified under: Nouns denoting substances Synonyms: atomic number 72; hafnium; Hf Hypernyms ("hafnium" is a kind of...): metal; metallic element (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)