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dipole
a molecule that has two electrically charged regions or poles
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  January 4 in chemistry
  1737 - Louis Bernard Guyton de Morveau born: one-time defender of phlogiston theory, chemical affinities, chemical nomenclature.
  1874 - John Edgar Teeple born: industrial chemistry and chemical economics; Perkin medal.
  1891 - Herbert Henry Dow, founder of Dow Chemical, prepared bromine from brine.
  1905 - Aristid V. Grosse born: isolated protactinium (Pa, element 91); U-235 fission by slow neutrons.
   sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com

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