Döbereiner's system of classification into tr | vedclass

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(D) Johann Wolfgang $D$öbereiner attempted to arrange elements with similar properties into groups of three,known as triads.In his system,the atomic m

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Five triads

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(D) Johann Wolfgang $D$öbereiner attempted to arrange elements with similar properties into groups of three,known as triads.In his system,the atomic mass of the middle element was approximately the arithmetic mean of the atomic masses of the other two elements.However,this system was not widely applicable because $D$öbereiner could identify only $5$ such triads from the elements known at that time.Therefore,the correct option is $D$.

$D$öbereiner's system of classification into triads was not found to be useful as he could identify only:

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