character: Dr. Brown
topic: Periodic Table Trends - Overview
grade: 9
subject: Chemistry
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character: Dr. Brown
topic: Atomic Radius Trends
grade: 9
subject: Chemistry
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character: Dr. Brown
topic: Electronegativity Trends
grade: 9
subject: Chemistry
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character: Dr. Brown
topic: Ionization Energy Trends
grade: 9
subject: Chemistry
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