1. atomic number 56 a soft silvery metallic element of the alkali earth group
  2. atomic number 53 a nonmetallic element belonging to the halogens
  3. atomic number 54 a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
  4. 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)
  5. atomic number 58 a ductile grey metallic element of the lanthanide series
  6. atomic number 76 a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
  7. atomic number 96 a radioactive transuranic metallic element
  8. atomic number 66 a trivalent metallic element of the rare earth group
  9. atomic number 52 a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold
  10. atomic number 36 a colorless element that is one of the six inert gasses
  11. atomic number 26 a heavy ductile magnetic metallic element
  12. 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
  13. atomic number 50 a silvery malleable metallic element that resists corrosion
  14. atomic number 51 a metallic element having four allotropic forms
  15. atomic number 55 a soft silver-white ductile metallic element
  16. atomic number 57 a white soft metallic element that tarnishes readily
  17. 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
  18. atomic number 65 a 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 5 a trivalent metalloid element

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