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ion
an atom or group of atoms that has gained or lost one or more electrons to acquire a net electric charge
  activity series  
  bond energy  
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  conversion factors: energy
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  vapor pressure of water
  October 30 in chemistry
  1817 - Hermann F. M. Kopp born: atomic and molecular volume.
  1895 - Gerhard Domagk born: antibiotic effect of the sulfanilamide drug prontosil; Nobel Prize (Medicine), 1939.
  1906 - Max Tishler born: synthetic pharmaceutical chemistry.
   sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com
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