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The modern day periodic table
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| Submitted: Thu Mar 24 2005
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Chemistry: Open Book Paper 1) The modern day periodic table is based on an earlier table proposed by Mendeleev. The modern day periodic table of elements is arranged in order of increasing atomic number. This differs from earlier attempts to classify elements. Döbreiner the first to attempt it classified elements using their atomic weights. He identified triads a set of three elements with similar properties. Elements are no longer identified into triads but into groups and are now arranged in order of increasing atomic number. Each element in a group has similar properties e.g Noble Gases. Mendeleev proposed a more accurate table of elements. He arranged the elements in order of increasing atomic weight organizing the table into horizontal rows. In doing so he noticed a pattern but only when he left gaps. From this he concluded that gaps left in his table were for undiscovered elements. Mendeleev then predicted the...
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