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John Newlands – Idea of Repeating Octaves of PropertiesEssay title: John Newlands – Idea of Repeating Octaves of PropertiesJohn Newlands – idea of repeating octaves of propertiesDimitry Mendeleyev – arranged known elements according to atomic weights and properties. Made predictions which were later proven accurate.Henry Moseley – utilised X-Ray. Said that periodic table should be.