character: Glenn T. Seaborg
topic: Discovery of Actinides and Expansion of the Periodic Table
grade: 12
subject: Chemistry
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character: Dmitri Mendeleev
topic: Development of the Periodic Table
grade: 12
subject: Chemistry
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character: Marie Curie
topic: Research on Radioactive Elements
grade: 12
subject: Chemistry
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character: John Dalton
topic: Atomic Theory and Early Models of Matter
grade: 12
subject: Chemistry
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