character: Sodium
topic: Cation, Positively Charged Ions
grade: 9
subject: Chemistry
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character: Potassium
topic: Cation, Similar Properties
grade: 9
subject: Chemistry
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character: Calcium
topic: Cation, Role in Biological Systems
grade: 9
subject: Chemistry
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character: Magnesium
topic: Cation, Importance in Chemical Reactions
grade: 9
subject: Chemistry
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