character: Dr. Marie Curie
topic: Contributions to Radioactivity and Atomic Theory
grade: 9
subject: Chemistry
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character: Oxygen
topic: Properties of Oxygen Atoms
grade: 9
subject: Chemistry
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character: Oxygen
topic: Chemical Reactions Involving Oxygen
grade: 9
subject: Chemistry
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character: Dr. Marie Curie
topic: The Impact of Radioactive Elements on Chemistry
grade: 9
subject: Chemistry
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