character: Marie Curie
topic: Radioactive Elements
grade: 9
subject: Chemistry
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character: Radium
topic: Chemical Reactions involving Radioactive Elements
grade: 9
subject: Chemistry
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character: Polonium
topic: Discovery of Radioactive Elements
grade: 9
subject: Chemistry
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character: Henri Becquerel
topic: Foundations of Radioactivity
grade: 9
subject: Chemistry
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