character: Dmitri Mendeleev
topic: Periodic Trends in Atomic Size
grade: 12
subject: Chemistry
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character: John Dalton
topic: Atomic Theory and Periodic Trends
grade: 12
subject: Chemistry
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character: J.J. Thomson
topic: Discovery of the Electron and Atomic Structure
grade: 12
subject: Chemistry
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character: Niels Bohr
topic: Bohr Model and Periodic Trends
grade: 12
subject: Chemistry
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