Periodic Table of the Elements

Peridic table

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definitions & notes only words
  1. hafnium
    a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
  2. yttrium
    a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
  3. ytterbium
    a soft silvery metallic element
  4. thorium
    a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
  5. berkelium
    a radioactive transuranic element
  6. mendelevium
    a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol)
  7. ruthenium
    a rare polyvalent metallic element of the platinum group
  8. platinum
    a heavy precious metallic element
  9. beryllium
    a light strong brittle grey toxic bivalent metallic element
  10. boron
    a trivalent metalloid element
  11. hydrogen
    a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
  12. helium
    a light colorless element that is one of the six inert gases
  13. lithium
    a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals
  14. uranium
    a heavy toxic silvery-white radioactive metallic element
  15. americium
    a radioactive transuranic metallic element
  16. cerium
    a ductile grey metallic element of the lanthanide series

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