character: Dmitri Mendeleev
topic: Periodic Table and Atomic Mass
grade: 11
subject: Chemistry
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character: John Dalton
topic: Development of Atomic Theory
grade: 11
subject: Chemistry
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character: Henry Moseley
topic: Revised Periodic Law and Atomic Number
grade: 11
subject: Chemistry
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character: Glenn T. Seaborg
topic: Actinide Series and Modern Periodic Table
grade: 11
subject: Chemistry
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