Assertion: grey tetravalent metallic element | /r/AtLocation | zirconium minerals
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Source sentences:
text: atomic number 72; hafnium; Hf (a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons)
text: Hf, atomic number 72, hafnium a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
text: Hf, atomic number 72, hafnium a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
text: hafnium a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons