character: John Dalton
topic: Law of Definite Proportions
grade: 9
subject: Physics
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character: Antoine Lavoisier
topic: Conservation of Mass
grade: 9
subject: Physics
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character: Joseph Proust
topic: Proust's Law of Definite Proportions
grade: 9
subject: Physics
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character: Dmitri Mendeleev
topic: Periodic Law and Atomic Theory
grade: 9
subject: Physics
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