character: John Newlands
topic: Law of Octaves in Periodic Development
grade: 11
subject: Chemistry
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character: Dmitri Mendeleev
topic: Periodic Table and its Development
grade: 11
subject: Chemistry
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character: Lothar Meyer
topic: Contributions to the Periodic Law
grade: 11
subject: Chemistry
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character: Henry Moseley
topic: Atomic Number and Periodic Trends
grade: 11
subject: Chemistry
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