character: Element Explorer
topic: Periodic Table Trends
grade: 9
subject: Chemistry
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character: Mendeleev
topic: Development of the Periodic Table
grade: 9
subject: Chemistry
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character: Periodic Trends Guru
topic: Trends in Atomic Radius and Electronegativity
grade: 9
subject: Chemistry
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character: Chemistry Explorer
topic: Properties of Alkali and Alkaline Earth Metals
grade: 9
subject: Chemistry
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