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