character: Periodic Table Explorer
topic: Periodic Trends
grade: 12
subject: Chemistry
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character: Mendeleev
topic: Development of the Periodic Table
grade: 12
subject: Chemistry
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character: Electronegativity
topic: Trends in the Periodic Table
grade: 12
subject: Chemistry
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character: Atomic Radius
topic: Periodic Trends
grade: 12
subject: Chemistry
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