1. atomic number 99 a radioactive transuranic element produced by bombarding plutonium with neutrons
  2. atomic number 95 a radioactive transuranic metallic element
  3. atomic number 49 a rare soft silvery metallic element
  4. atomic number 90 a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
  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 96 a radioactive transuranic metallic element
  7. atomic number 94 a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239
  8. atomic number 89 a radioactive element of the actinide series
  9. atomic number 79 a soft yellow malleable ductile metallic element
  10. atomic number 93 a radioactive transuranic metallic element
  11. atomic number 97 a radioactive transuranic element
  12. atomic number 19 a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite
  13. atomic number 39 a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
  14. atomic number 59 a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
  15. atomic number 69 a soft silvery metallic element of the rare earth group
  16. atomic number 91 a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
  17. atomic number 92 a heavy toxic silvery-white radioactive metallic element
  18. atomic number 98 a radioactive transuranic element
  19. atomic number 9 a nonmetallic univalent element belonging to the halogens
  20. atomic number 109 a radioactive transuranic element

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