character: Ernest Rutherford
topic: Discovery of the nucleus
grade: 9
subject: Chemistry
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character: Marie Curie
topic: Contributions to nuclear chemistry
grade: 9
subject: Chemistry
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character: Niels Bohr
topic: Bohr model and atomic structure
grade: 9
subject: Chemistry
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character: James Chadwick
topic: Discovery of the neutron
grade: 9
subject: Chemistry
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