character: Dmitri Mendeleev
topic: Periodic Table and Quantitative Relationships
grade: 12
subject: Chemistry
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character: John Dalton
topic: Atomic Theory and its Relation to the Periodic Table
grade: 12
subject: Chemistry
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character: J.J. Thomson
topic: Electron Discovery and its Impact on the Periodic Table
grade: 12
subject: Chemistry
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character: Henry Moseley
topic: Atomic Number and the Modern Periodic Table
grade: 12
subject: Chemistry
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