He grouped elements with similar properties into sets of three called triads., Johann Dobereiner, Henry Moseley, He proposed that the properties of elements repeated every eight elements, known as the Law of Octaves., Henry Moseley, John Newlands, He is considered the as the "Father of Periodic Table"., Johann Dobereiner, Dmitri Mendeleev, He demonstrated that atomic number determines the arrangement of elements in the periodic table., Henry Moseley, Dmitri Mendeleev.

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