character: Ernest Rutherford
topic: Further developments in nuclear physics and radioactivity
grade: 9
subject: Physics
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character: Marie Curie
topic: Discovery of radium and polonium
grade: 9
subject: Physics
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character: Niels Bohr
topic: The Bohr model of the atom
grade: 9
subject: Physics
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character: James Chadwick
topic: Discovery of the neutron
grade: 9
subject: Physics
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