1. atomic number 76 a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
  2. atomic number 77 a heavy brittle metallic element of the platinum group
  3. 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
  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 78 a heavy precious metallic element
  6. atomic number 96 a radioactive transuranic metallic element
  7. atomic number 66 a trivalent metallic element of the rare earth group
  8. atomic number 67 a trivalent metallic element of the rare earth group
  9. atomic number 36 a colorless element that is one of the six inert gasses
  10. atomic number 73 a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
  11. atomic number 26 a heavy ductile magnetic metallic element
  12. atomic number 74 a heavy grey-white metallic element
  13. atomic number 79 a soft yellow malleable ductile metallic element
  14. 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
  15. atomic number 56 a soft silvery metallic element of the alkali earth group
  16. atomic number 70 a soft silvery metallic element
  17. atomic number 71 a trivalent metallic element of the rare earth group
  18. atomic number 72 a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
  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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