character: John Dalton
topic: Atomic Theory and Elements
grade: 9
subject: Chemistry
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character: Dmitri Mendeleev
topic: Periodic Table and Chemical Elements
grade: 9
subject: Chemistry
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character: Democritus
topic: Early Ideas of Atomic Theory
grade: 9
subject: Chemistry
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character: Marie Curie
topic: Discovery of Radioactivity and Elements
grade: 9
subject: Chemistry
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