1. atomic number 28 a hard malleable ductile silvery metallic element that is resistant to corrosion; used in alloys; occurs in pentlandite and smaltite and garnierite and millerite
  2. atomic number 58 a ductile grey metallic element of the lanthanide series
  3. atomic number 78 a heavy precious metallic element
  4. atomic number 88 an intensely radioactive metallic element that occurs in minute amounts in uranium ores
  5. 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
  6. atomic number 18 a colorless and odorless inert gas
  7. atomic number 25 a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals
  8. atomic number 21 a white trivalent metallic element
  9. 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
  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 24 a hard brittle multivalent metallic element
  12. atomic number 26 a heavy ductile magnetic metallic element
  13. atomic number 82 a soft heavy toxic malleable metallic element
  14. atomic number 20 a white metallic element that burns with a brilliant light
  15. atomic number 23 a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite
  16. atomic number 38 a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite
  17. atomic number 48 a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores
  18. atomic number 68 a trivalent metallic element of the rare earth group
  19. atomic number 98 a radioactive transuranic 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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