Döbereiner arranged the elements in triads in the increasing order of their .

atomic masses

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atomic numbers

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Solution

The correct option is A atomic masses
The elements in Döbereiner’s triads are arranged in the increasing order of their atomic masses. He proposed that the atomic mass of the middle element is the arithmetic mean of the other two elements.

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Triads of elements arranged in increasing order of their atomic masses were proposed by-

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