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Classified Some elements into groups of free, which he called triads. The element in a triad had similar chemical properties and orderly physical properties
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John Newlands suggested the Law of Octaves
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Suggested that elements can be arranged in octaves because he noticesd after arranging the elements in order of increaing atomic mass that certain properties repeated every 8th element
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Dimitri Mendeleev publised a table of elements organised by increasing atomic mass. At the same time Lothar Meyer organised a table by the increaing atomic mass
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His table was generally accepted as unknown elements between 1974 and 1885
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The law of Octaves was proved wrong as the octaves failed beyond calcium
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Through his work with X-Rays he dtermined the actual nuclear charge of the
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Co discover 10 new elements he moved 14 elements out of the main body and moved them under the Lanthanide series to be known as the Actinide Series