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law of multiple proportions
when two elements form more than one compound, the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers
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  November 21 in chemistry
  1824 - Hieronymous T. Richter born: codiscoverer of indium (In, element 49).
  1867 - Vladimir N. Ipatieff born: high-pressure catalysis; petroleum chemistry.
   sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com
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