1. atomic number 74 a heavy grey-white metallic element
  2. atomic number 77 a heavy brittle metallic element of the platinum group
  3. atomic number 54 a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
  4. 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
  5. atomic number 47 a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography
  6. atomic number 76 a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
  7. atomic number 78 a heavy precious metallic element
  8. atomic number 14 a tetravalent nonmetallic element
  9. atomic number 94 a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239
  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 24 a hard brittle multivalent metallic element
  12. atomic number 64 a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
  13. atomic number 79 a soft yellow malleable ductile metallic element
  14. atomic number 84 a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
  15. atomic number 34 a toxic nonmetallic element related to sulfur and tellurium
  16. atomic number 44 a rare polyvalent metallic element of the platinum 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 4 a light strong brittle grey toxic bivalent metallic element

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