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# In Dobereiner's triad, elements showed similarities in ___________.

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## The average Dobereiner's triad:-According to Dobereiner, three elements in a triad were arranged according to the increasing order of atomic masses. Then the atomic mass of the middle element was roughly the average atomic masses of the other two elements present in that triad. Dobereiner identified groups of three elements that had similar properties (called triads).For example:Elements$\mathrm{Li}\mathrm{Na}\mathrm{K}$$\mathrm{Cl}\mathrm{Br}\mathrm{I}$$\mathrm{Ca}\mathrm{Sr}\mathrm{Ba}$Atomic masses$72339$$35.580127$$4088137$The average atomic mass of the first and third element$\frac{7+39}{2}=23$$\frac{35.5+127}{2}=81.25$$\frac{40+137}{2}=88.5$But there was a major drawback in Dobereiner's triad.It was that all the elements which were discovered at that time could not be classified into triads. Only a limited number of elements were able to be arranged in such triads.Therefore, in Dobereiner's Triad, elements showed similarities in properties.

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