character: Henry Moseley
topic: Reorganization of the Periodic Table by Atomic Number
grade: 8
subject: History
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character: Dmitri Mendeleev
topic: Development of the Periodic Table
grade: 8
subject: History
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character: John Dalton
topic: Early Atomic Theory
grade: 8
subject: History
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character: Lothar Meyer
topic: Periodic Relationships in Elements
grade: 8
subject: History
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