character: Dmitri Mendeleev
topic: Trends in Energy Changes Across the Periodic Table
grade: 12
subject: Chemistry
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character: John Dalton
topic: Historical Development of the Periodic Table
grade: 12
subject: Chemistry
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character: Linus Pauling
topic: Electronegativity and Periodic Trends
grade: 12
subject: Chemistry
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character: Marie Curie
topic: Radioactivity and Its Trends in the Periodic Table
grade: 12
subject: Chemistry
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