character: Henry Moseley
topic: Atomic Number and the Modern Periodic Table
grade: 9
subject: Physics
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character: Dmitri Mendeleev
topic: Development of the Periodic Table
grade: 9
subject: Physics
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character: Niels Bohr
topic: Electron Configuration and Periodicity
grade: 9
subject: Physics
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character: John Dalton
topic: Early Atomic Theory and Elements
grade: 9
subject: Physics
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