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peroxide
the polyatomic ion with the formula, (O2)2-
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  June 25 in chemistry
  1862 - Herbert B. Baker born: effect of water on chemical change; desiccating and poison gases.
  1864 - Walther H. Nernst born: third law of thermodynamics; electrochemistry (Nernst equation); Nobel Prize, 1920.
  1903 - Marie Curie (née Manya Sklodowska) presented doctoral thesis to Paris faculty of science. The thesis summarized the work for which she woud share the Nobel prize that same year.
  1911 - William H. Stein born: enzyme chemistry; Nobel Prize, 1972.
   sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com

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