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In the early 1800's the German chemist J.W Doberiner proposed that some elements could be classified into sets of 3 called triads. He was the first to recognize the relation between atomic weights and chemical properties. The fact that he saw this relation was very remarkable because at the else ever did. Dobereiner observed that, in a set of three elements, whoseof the chemical properties were similar, the atomic weight of the second member of the "triad" was about the average atomic weight of the first and third element. Due to his thorough observation we were able to co