character: Henri Becquerel
topic: Discovery of Uranic Ray
grade: 12
subject: Physics
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character: Marie Curie
topic: Further Research on Radioactivity
grade: 12
subject: Physics
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character: Ernest Rutherford
topic: Alpha and Beta Rays
grade: 12
subject: Physics
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character: James Chadwick
topic: Discovery of the Neutron
grade: 12
subject: Physics
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