1. atomic number 23 a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite
  2. atomic number 53 a nonmetallic element belonging to the halogens
  3. 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
  4. atomic number 13 a silvery ductile metallic element found primarily in bauxite
  5. 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
  6. atomic number 21 a white trivalent metallic element
  7. 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
  8. atomic number 32 a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite
  9. atomic number 43 a crystalline metallic element not found in nature
  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 73 a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
  12. atomic number 83 a heavy brittle diamagnetic trivalent metallic element
  13. atomic number 24 a hard brittle multivalent metallic element
  14. atomic number 26 a heavy ductile magnetic metallic element
  15. atomic number 33 a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
  16. atomic number 93 a radioactive transuranic metallic element
  17. atomic number 20 a white metallic element that burns with a brilliant light
  18. 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
  19. atomic number 63 a bivalent and trivalent metallic element of the rare earth group
  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)