1. atomic number 79 a soft yellow malleable ductile metallic element
  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 49 a rare soft silvery metallic element
  5. atomic number 76 a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
  6. atomic number 78 a heavy precious metallic element
  7. atomic number 29 a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor
  8. atomic number 99 a radioactive transuranic element produced by bombarding plutonium with neutrons
  9. atomic number 89 a radioactive element of the actinide series
  10. atomic number 73 a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
  11. atomic number 74 a heavy grey-white metallic element
  12. atomic number 97 a radioactive transuranic element
  13. atomic number 19 a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite
  14. atomic number 39 a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
  15. atomic number 59 a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
  16. atomic number 69 a soft silvery 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 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
  20. atomic number 9 a nonmetallic univalent element belonging to the halogens

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