on what basis did johann wolfgang classify the elements

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Solution

The basis of classification of Johann Wolfgang Dobereiner 's traids is atomic mass.
Dobereiner arranged elements in the form of triads.In each triad the elements are arranged in increasing order of their atomic mass. The atomic mass of the middle element is equal to the average atomic mass of both the terminal elements.

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Johann Dobereiner classified elements in group of three elements called as

(a) On what basis did Mendeleev arrange the elements in his periodic table?

(b) On what basis are they arranged now?

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