character: Democritus
topic: Early Atomic Theory
grade: 9
subject: Science
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character: John Dalton
topic: Atomic Theory Development
grade: 9
subject: Science
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character: Ernest Rutherford
topic: Nuclear Atomic Model
grade: 9
subject: Science
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character: Niels Bohr
topic: Bohr Model of the Atom
grade: 9
subject: Science
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