1. atomic number 36 a colorless element that is one of the six inert gasses
  2. atomic number 16 an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)
  3. atomic number 76 a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
  4. atomic number 96 a radioactive transuranic metallic element
  5. atomic number 66 a trivalent metallic element of the rare earth group
  6. atomic number 35 a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
  7. atomic number 32 a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite
  8. atomic number 26 a heavy ductile magnetic metallic element
  9. 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
  10. atomic number 30 a bluish-white lustrous metallic element
  11. atomic number 31 a rare silvery metallic element
  12. atomic number 34 a toxic nonmetallic element related to sulfur and tellurium
  13. atomic number 37 a soft silvery metallic element of the alkali metal group
  14. 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
  15. atomic number 39 a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
  16. atomic number 46 a silver-white metallic element of the platinum group that resembles platinum; occurs in some copper and nickel ores; does not tarnish at ordinary temperatures and is used (alloyed with gold) in jewelry
  17. atomic number 56 a soft silvery metallic element of the alkali earth group
  18. atomic number 63 a bivalent and trivalent metallic element of the rare earth group
  19. atomic number 86 a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health
  20. atomic number 6 an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds

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