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Open Book Paper - The Development of the Periodic Table 1. Development of the Periodic Table When the first ever attempt was made to draw up a systematic arrangement, sixty elements had been discovered. Johann Dobereiner made the first attempt to classify the elements in terms of relative atomic mass. Then John Newlands discovered that when elements are placed in order of increasing relative atomic mass after every eighth element, similar physical and chemical properties reappeared. These attempts vary greatly compared to the modern periodic table, as these theories are similar; in effect they have no real link to the modern periodic table. Then Mendeleev suggested placing the elements in increasing atomic weights, so elements with similar properties came in the same vertical group. After placing the elements under his suggestion there were eight groups and twelve periods. (1) Discovery of Gallium and how it Supported Mendeleev's Ideas Mendeleev left gaps where...

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