Periodic Table of the Elements 16 words

Peridic table
  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; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime
  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; discovered by bombarding americium with helium
  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; it is found associated with platinum
  8. platinum
    a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits
  9. beryllium
    a light strong brittle grey toxic bivalent metallic element
  10. boron
    a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
  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 very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
  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; occurs in many isotopes; used for nuclear fuels and nuclear weapons
  15. americium
    a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms
  16. cerium
    a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group