1. atomic number 62 a grey lustrous metallic element of the rare earth group
  2. atomic number 66 a trivalent metallic element of the rare earth group
  3. atomic number 52 a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold
  4. atomic number 12 a light silver-white ductile bivalent metallic element
  5. 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
  6. atomic number 32 a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite
  7. atomic number 67 a trivalent metallic element of the rare earth group
  8. atomic number 26 a heavy ductile magnetic metallic element
  9. 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
  10. atomic number 64 a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
  11. atomic number 82 a soft heavy toxic malleable metallic element
  12. atomic number 42 a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel
  13. atomic number 60 a yellow trivalent metallic element of the rare earth group
  14. atomic number 63 a bivalent and trivalent metallic element of the rare earth group
  15. atomic number 65 a metallic element of the rare earth group
  16. atomic number 68 a trivalent metallic element of the rare earth group
  17. atomic number 69 a soft silvery metallic element of the rare earth group
  18. 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
  19. atomic number 92 a heavy toxic silvery-white radioactive metallic element
  20. atomic number 6 an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds