character: Democritus
topic: Early Ideas on Atomic Theory
grade: 9
subject: Chemistry
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character: John Dalton
topic: Modern Atomic Theory
grade: 9
subject: Chemistry
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character: Niels Bohr
topic: Bohr Model of the Atom
grade: 9
subject: Chemistry
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character: Erwin Schrödinger
topic: Quantum Mechanical Model of the Atom
grade: 9
subject: Chemistry
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