character: Dmitri Mendeleev
topic: The Development of the Periodic Law
grade: 12
subject: Chemistry
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character: John Dalton
topic: Atomic Theory and the Early Periodic Table
grade: 12
subject: Chemistry
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character: Henry Moseley
topic: Refinement of the Periodic Table: Atomic Number
grade: 12
subject: Chemistry
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character: Glenn T. Seaborg
topic: The Actinide Series and the Modern Periodic Table
grade: 12
subject: Chemistry
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