Dobereinier’s law of tirade



Dobereinier’s law of tirade

In 1817 Dobereiner found that when elements are arranged in the order of increasing atomic masses, groups of three elements (known as triads) having similar chemical properties are obtained. The atomic mass of the middle element was found to be the average of the rest of the two :


Li                  Na                  K

7                   23                  39

Na = (7 + 39) / 2  = 23

This classification of elements failed because it could not cover all the then known elements.



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