character: Henry Moseley
topic: Refinement of the Periodic Table: 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 Its Impact on Chemistry
grade: 12
subject: Chemistry
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character: Niels Bohr
topic: Atomic Structure and Periodicity
grade: 12
subject: Chemistry
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