1. atomic number 65 a metallic element of the rare earth group
  2. atomic number 95 a radioactive transuranic metallic element
  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 66 a trivalent metallic element of the rare earth group
  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 35 a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
  7. atomic number 67 a trivalent metallic element of the rare earth group
  8. 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
  9. atomic number 64 a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
  10. atomic number 85 a highly unstable radioactive element
  11. atomic number 15 a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms
  12. atomic number 45 a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum
  13. atomic number 55 a soft silver-white ductile metallic element
  14. atomic number 56 a soft silvery metallic element of the alkali earth group
  15. atomic number 60 a yellow trivalent metallic element of the rare earth group
  16. atomic number 62 a grey lustrous metallic element of the rare earth group
  17. atomic number 63 a bivalent and trivalent 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 5 a trivalent metalloid element

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