Contributions to the Periodic Table...
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Antoine Lavoisier was a French Chemist who is known as the "Father of Modern Chemistry". He formed a new theory of chemical reactivity of Oxygen and co-wrote the modern system for the chemical substances. Lavoisier also apposed the phlogiston theory. He also developed the first list of 33 elements.
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John Newlands was an English scientist who came up with the "Law of Octaves" in 1864. Newlands created a table in which he arranged all the known elements in order of atomic mass. He realized that each element was similar to the element eight places further down, they had similar physical and chemical properties.
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Lothar Meyer was a German chemist. Meyer had produced a table of only 28 elements in which he listed them by valence. On a separate table he listed the transition metals by the increasing weight with elements of the same valence in the same column. Meyer had come up with these tables before Mendeleev but had not published it until after Mendeleev published his table.
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Dmitri Mendeleev a Russian chemist published the Periodic Table. Mendeleev arranged the 63 known elements at the time by atomic mass. He predicted the existence of other elements so he left blank spaces for those spots to be filled in. Not only did Mendeleev arrange the elements by atomic mass but he also grouped them by similarity of properties.
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Moseley was a British chemist who developed the application of X-ray spectra to study the atomic structure. His discoveries had a result of a more accurate positioning of elements in the Periodic Table. Today the Periodic Table is arranged on the atomic numbers of the elements thanks to Henry Moseley.