1. atomic number 35 a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
  2. atomic number 53 a nonmetallic element belonging to the halogens
  3. atomic number 95 a radioactive transuranic metallic element
  4. 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
  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 32 a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite
  7. atomic number 36 a colorless element that is one of the six inert gasses
  8. 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
  9. atomic number 85 a highly unstable radioactive element
  10. 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
  11. atomic number 30 a bluish-white lustrous metallic element
  12. atomic number 31 a rare silvery metallic element
  13. atomic number 34 a toxic nonmetallic element related to sulfur and tellurium
  14. atomic number 37 a soft silvery metallic element of the alkali metal group
  15. 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
  16. atomic number 39 a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
  17. 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
  18. atomic number 55 a soft silver-white ductile metallic element
  19. atomic number 65 a metallic element of the rare earth group
  20. atomic number 5 a trivalent metalloid element

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