1. atomic number 7 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
  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 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
  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 1 a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
  8. atomic number 17 a common nonmetallic element belonging to the halogens
  9. atomic number 67 a trivalent metallic element of the rare earth group
  10. atomic number 87 a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
  11. atomic number 27 a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
  12. atomic number 73 a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
  13. atomic number 74 a heavy grey-white metallic element
  14. atomic number 79 a soft yellow malleable ductile metallic element
  15. atomic number 97 a radioactive transuranic element
  16. atomic number 37 a soft silvery metallic element of the alkali metal group
  17. atomic number 57 a white soft metallic element that tarnishes readily
  18. atomic number 70 a soft silvery metallic element
  19. atomic number 71 a trivalent metallic element of the rare earth group
  20. 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

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