character: Periodic Table Pete
topic: Trends in Electron Configuration
grade: 9
subject: Chemistry
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character: Chemistry Carl
topic: Understanding Electron Shells
grade: 9
subject: Chemistry
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character: Element Emma
topic: Periodic Trends: Atomic Size and Ionization Energy
grade: 9
subject: Chemistry
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character: Reactive Rachel
topic: Trends in Reactivity of Elements
grade: 9
subject: Chemistry
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