character: Hans Geiger
topic: Geiger Counter and Its Role in Radioactivity
grade: 12
subject: Chemistry
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character: Marie Curie
topic: Discovery of Radioactivity
grade: 12
subject: Chemistry
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character: Ernest Rutherford
topic: Nuclear Model of the Atom
grade: 12
subject: Chemistry
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character: James Chadwick
topic: Discovery of the Neutron
grade: 12
subject: Chemistry
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