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Chemistry Essay Modern Periodic Table 1 Gallium 1 Spectroscopy 2 UNILAC 3 Chemistry in the last 200 Years 3 Bibliography 4 Modern Periodic Table The modern periodic table has evolved over mainly the last 200 years; one of the first methods for arranging the elements was by atom weights. This was done by Johann Döbereiner, he also arranged the elements into triads, these were groups of three elements which had similar properties, and the two outside elements has an average atomic weight to that of the middle element. John Newlands in 1863 noticed another pattern with the elements which was that if they were ordered with increasing atomic weights every eight element had similar properties and subsequently called this the Octave Law. A Russian in 1869, Dimitri Mendeleev, was the first chemist to leave gaps for elements which had not yet been discovered; he also noticed patterns within the elements and predicted the properties of these undiscovered elements. Mendeleev' predictions were confirmed in 1875...

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