character: John Dalton
topic: History of Chemistry and Dalton's Contributions
grade: 9
subject: Physics
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character: Democritus
topic: Early Atomic Theory and Development of Atomic Models
grade: 9
subject: Physics
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character: Dmitri Mendeleev
topic: Periodic Table and Contributions to Chemistry
grade: 9
subject: Physics
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character: Lavoisier
topic: Father of Modern Chemistry and Law of Conservation of Mass
grade: 9
subject: Physics
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