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Attempts to classify the elements began in early 19th century, by the grouping of elements which sha
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Attempts to classify the elements began in early 19th century, by the grouping of elements which shared similar chemical characteristics. The German chemist Johann Dobereiner succeeded in formulating a mathematical relationship between the relative atomic masses of sets of three elements, which he called 'triads', however scientists later found that the atomic weight relationship of elements extended beyond this. The first to arrange the elements into a table was the English scientist John Newlands. According to his 'Law of Octaves', he noticed that if the 62 known elements of the time were put in order of increasing relative atomic mass, then after intervals of eight similar properties could be observed. However, due to inaccuracies within his measurements, there were errors within his table and therefore his table was not accepted. Newlands table of elements - original version at http://web.fccj.org/~ethall/period/period.htm It was the Russian chemistry professor, Dimitri Mendeleev who achieved a periodic table...
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