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Question : What were the limitations of Dobreiner's classification?

Answer»

Solution :He classified in group of THREE such that atomic No. of middle elements is average of first and third element. Eg: Li(7), Na(23), K(39), Limitations :
* Dobereiner could find only three TRIADS, i.e. total of 9 elements only.
* However the total number of elements were more than that of those encompassed in Dobereiner.s triad.
* Thus Dobereiner could not CLASSIFY most of the elements known at that time..


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