character: Chemical Elements Overview
topic: Introduction to Chemical Elements
grade: 9
subject: Chemistry
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character: Periodic Table
topic: Understanding the Properties of Elements
grade: 9
subject: Chemistry
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character: Atomic Structure
topic: Characteristics of Different Elements
grade: 9
subject: Chemistry
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character: Reactivity and Group Trends
topic: How Element Properties Vary
grade: 9
subject: Chemistry
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