character: James Chadwick
topic: Discovery of the neutron
grade: 9
subject: Physics
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character: Ernest Rutherford
topic: Importance of the nucleus in atomic structure
grade: 9
subject: Physics
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character: Niels Bohr
topic: Bohr model of the atom and electron behavior
grade: 9
subject: Physics
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character: Marie Curie
topic: Contributions to radioactivity and atomic theory
grade: 9
subject: Physics
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