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Dmitri Mendeleev and John Newlands both contributed to the development of the Periodic Table, but their approaches differed significantly. Newlands proposed the Law of Octaves in 1865, suggesting that elements could be arranged in order of increasing Atomic Mass, with similar properties occurring every eight elements. In contrast, Mendeleev, in 1869, developed a more systematic periodic table that not only arranged elements by atomic mass but also grouped them by similar chemical properties, leaving gaps for undiscovered elements and predicting their properties. This predictive aspect and the emphasis on grouping by properties marked a significant advancement in the organization of elements compared to Newlands' work.

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