1. 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
  2. atomic number 54 a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
  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 49 a rare soft silvery metallic element
  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 40 a lustrous grey strong metallic element resembling titanium
  8. 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
  9. atomic number 35 a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
  10. atomic number 43 a crystalline metallic element not found in nature
  11. atomic number 41 a soft grey ductile metallic element used in alloys
  12. atomic number 85 a highly unstable radioactive element
  13. 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
  14. atomic number 42 a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel
  15. atomic number 44 a rare polyvalent metallic element of the platinum group
  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 48 a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores
  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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