character: Dr. Lee
topic: Periodic Trends and Valence Electrons
grade: 9
subject: Chemistry
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character: Ms. Chen
topic: Understanding Atomic Radius and Ionization Energy
grade: 9
subject: Chemistry
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character: Mr. Johnson
topic: Electron Configuration and Its Role in Reactivity
grade: 9
subject: Chemistry
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character: Professor Smith
topic: Periodic Table: Groups and Periods Explained
grade: 9
subject: Chemistry
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