1. atomic number 34 a toxic nonmetallic element related to sulfur and tellurium
  2. atomic number 54 a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
  3. atomic number 14 a tetravalent nonmetallic element
  4. atomic number 35 a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
  5. 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
  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 43 a crystalline metallic element not found in nature
  8. atomic number 36 a colorless element that is one of the six inert gasses
  9. atomic number 24 a hard brittle multivalent metallic element
  10. 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
  11. atomic number 64 a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
  12. atomic number 74 a heavy grey-white metallic element
  13. atomic number 84 a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
  14. atomic number 30 a bluish-white lustrous metallic element
  15. atomic number 31 a rare silvery metallic element
  16. atomic number 37 a soft silvery metallic element of the alkali metal group
  17. 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
  18. atomic number 39 a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
  19. atomic number 44 a rare polyvalent metallic element of the platinum group
  20. atomic number 4 a light strong brittle grey toxic bivalent metallic element

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