(n)a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia, Syn.Au, atomic number 79
(n)a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons, Syn.atomic number 72, Hf
(n)a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues, Syn.N, atomic number 7
(n)a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits, Syn.atomic number 78, Pt
(n)a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum, Syn.atomic number 75, Re
(n)a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite, Syn.Ta, atomic number 73
(n)a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite, Syn.W, wolfram, atomic number 74