1. hafnium

noun. (ˈhæfniːəm) A grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons.
Synonyms
metal Hf metallic element atomic number 72
Antonyms
nonmetallic
Etymology
hafnium (English)
Hafnia (Latin)
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