1. atomic number 57 a white soft metallic element that tarnishes readily
  2. atomic number 77 a heavy brittle metallic element of the platinum group
  3. atomic number 53 a nonmetallic element belonging to the halogens
  4. atomic number 54 a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
  5. 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
  6. atomic number 47 a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography
  7. atomic number 58 a ductile grey metallic element of the lanthanide series
  8. 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
  9. atomic number 17 a common nonmetallic element belonging to the halogens
  10. atomic number 67 a trivalent metallic element of the rare earth group
  11. atomic number 87 a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
  12. atomic number 27 a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
  13. atomic number 97 a radioactive transuranic element
  14. atomic number 37 a soft silvery metallic element of the alkali metal group
  15. atomic number 50 a silvery malleable metallic element that resists corrosion
  16. atomic number 51 a metallic element having four allotropic forms
  17. atomic number 55 a soft silver-white ductile metallic element
  18. atomic number 56 a soft silvery metallic element of the alkali earth group
  19. 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
  20. atomic number 5 a trivalent metalloid element

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