character: Henry Moseley
topic: Periodic Law and Atomic Number
grade: 12
subject: Chemistry
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character: Dmitri Mendeleev
topic: Development of the Periodic Table
grade: 12
subject: Chemistry
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character: John Dalton
topic: Atomic Theory and Early Atomic Models
grade: 12
subject: Chemistry
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character: Niels Bohr
topic: Bohr Model and Quantum Theory
grade: 12
subject: Chemistry
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