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Essay text:
Ernest Rutherford showed that the nuclear charge on a nucleus was proportional to the atomic weight of elements in 1911. Three years later in 1914, Henry Mosely determined the atomic numbers of each of the elements, stating that the properties of the elements vary directly with their atomic numbers. Finally, in 1940, Glenn Seaborg discovered all the elements from 94 to 102 and reconstructed the periodic table for the last major changed to the Modern Periodic Table
Sources
http://www.wou.edu/las/physci/ch412/perhist.htm
http://www.chemsoc.org/viselements/pages/history.html
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