1. atomic number 72 a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
  2. atomic number 77 a heavy brittle metallic element of the platinum group
  3. atomic number 75 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
  4. atomic number 76 a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
  5. atomic number 78 a heavy precious metallic element
  6. atomic number 52 a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold
  7. atomic number 12 a light silver-white ductile bivalent metallic element
  8. atomic number 22 a light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite
  9. atomic number 32 a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite
  10. atomic number 27 a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
  11. atomic number 73 a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
  12. atomic number 74 a heavy grey-white metallic element
  13. atomic number 79 a soft yellow malleable ductile metallic element
  14. atomic number 82 a soft heavy toxic malleable metallic element
  15. atomic number 42 a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel
  16. atomic number 62 a grey lustrous metallic element of the rare earth group
  17. atomic number 70 a soft silvery metallic element
  18. atomic number 71 a trivalent metallic element of the rare earth group
  19. atomic number 92 a heavy toxic silvery-white radioactive metallic element
  20. atomic number 2 a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)

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