character: Dmitri Mendeleev
topic: Periodic Law and Chemical Properties
grade: 12
subject: Chemistry
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character: Valence Electrons
topic: Influence on Chemical Properties
grade: 12
subject: Chemistry
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character: John Newlands
topic: Law of Octaves and Periodicity
grade: 12
subject: Chemistry
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character: Henry Moseley
topic: Periodic Table and Atomic Number
grade: 12
subject: Chemistry
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