character: Dmitri Mendeleev
topic: Properties of Elements
grade: 12
subject: Chemistry
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character: Glenn T. Seaborg
topic: Expansion of the Periodic Table
grade: 12
subject: Chemistry
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character: John Dalton
topic: Atomic Theory and Element Properties
grade: 12
subject: Chemistry
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character: J.J. Thomson
topic: Discovery of the Electron and its Role in Chemical Properties
grade: 12
subject: Chemistry
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