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The Development Of The Periodic Table
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The Development Of The Periodic Table The modern periodic table is based on Mendeleev's table. He left gaps in his table for elements yet to be discovered but now all the gaps have been filled in because new elements have been discovered over the last 140years. A whole new group was introduced for the noble gases because none were discovered then. The elements are arranged in order of increasing atomic number. The arrangement of electrons in atoms has helped to explain the patterns of behaviour and properties of the elements. The modern periodic table differs from the earlier attempts to classify elements because Johann Dobereiner classified elements using their atomic weights (relative atomic mass) but today it is the increasing atomic number. Another attempt was by John Newlands. He attempted to arrange the elements in Octaves. Paul Emile Lecoq de Boisbaudran who was a French scientist discovered gallium in 1875. The discovery of...
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