character: Lothar Meyer
topic: Development of Periodic Law
grade: 12
subject: Chemistry
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character: Dmitri Mendeleev
topic: Periodic Table Contributions
grade: 12
subject: Chemistry
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character: John Newlands
topic: Law of Octaves
grade: 12
subject: Chemistry
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character: Henry Moseley
topic: Atomic Number and Periodic Law
grade: 12
subject: Chemistry
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