1. atomic number 6 an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
  2. atomic number 16 an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)
  3. atomic number 76 a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
  4. atomic number 96 a radioactive transuranic metallic element
  5. atomic number 66 a trivalent metallic element of the rare earth group
  6. 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
  7. atomic number 67 a trivalent metallic element of the rare earth group
  8. atomic number 36 a colorless element that is one of the six inert gasses
  9. atomic number 26 a heavy ductile magnetic metallic element
  10. atomic number 61 a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
  11. atomic number 64 a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
  12. atomic number 46 a silver-white metallic element of the platinum group that resembles platinum; occurs in some copper and nickel ores; does not tarnish at ordinary temperatures and is used (alloyed with gold) in jewelry
  13. atomic number 56 a soft silvery metallic element of the alkali earth group
  14. atomic number 60 a yellow trivalent metallic element of the rare earth group
  15. atomic number 62 a grey lustrous metallic element of the rare earth group
  16. atomic number 63 a bivalent and trivalent metallic element of the rare earth group
  17. atomic number 65 a metallic element of the rare earth group
  18. atomic number 68 a trivalent metallic element of the rare earth group
  19. atomic number 69 a soft silvery metallic element of the rare earth group
  20. atomic number 86 a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health

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