character: Dr. Smith
topic: Periodic Trends
grade: 9
subject: Chemistry
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character: Professor Johnson
topic: Atomic Structure and Periodic Table
grade: 9
subject: Chemistry
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character: Ms. Lee
topic: Properties of Elements Across Periods and Groups
grade: 9
subject: Chemistry
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character: Mr. Davis
topic: Trends in Atomic Radius and Electronegativity
grade: 9
subject: Chemistry
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