character: John Dalton
topic: Atomic Theory
grade: 12
subject: Chemistry
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character: Dmitri Mendeleev
topic: Periodic Table of Elements
grade: 12
subject: Chemistry
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character: J.J. Thomson
topic: Discovery of the Electron
grade: 12
subject: Chemistry
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character: Ernest Rutherford
topic: Nuclear Model of the Atom
grade: 12
subject: Chemistry
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