character: Marie Curie
topic: Discovery of Radium and Polonium
grade: 9
subject: Chemistry
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character: Henri Becquerel
topic: Discovery of Radioactivity
grade: 9
subject: Chemistry
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character: Ernest Rutherford
topic: Research on Radioactive Elements
grade: 9
subject: Chemistry
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character: Pierre Curie
topic: Collaboration with Marie Curie on Radioactivity
grade: 9
subject: Chemistry
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