1. 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
  2. atomic number 53 a nonmetallic element belonging to the halogens
  3. atomic number 13 a silvery ductile metallic element found primarily in bauxite
  4. atomic number 35 a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
  5. atomic number 32 a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite
  6. atomic number 43 a crystalline metallic element not found in nature
  7. atomic number 36 a colorless element that is one of the six inert gasses
  8. atomic number 73 a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
  9. atomic number 83 a heavy brittle diamagnetic trivalent metallic element
  10. atomic number 93 a radioactive transuranic metallic element
  11. atomic number 23 a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite
  12. atomic number 30 a bluish-white lustrous metallic element
  13. atomic number 31 a rare silvery metallic element
  14. atomic number 34 a toxic nonmetallic element related to sulfur and tellurium
  15. atomic number 37 a soft silvery metallic element of the alkali metal group
  16. 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
  17. atomic number 39 a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
  18. atomic number 63 a bivalent and trivalent metallic element of the rare earth group
  19. atomic number 3 a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals
  20. atomic number 103 a radioactive transuranic element synthesized from californium

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