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What was Dobereiner's basis of classifying elements?

What was Dobereiner's basis of classifying elements?

Answer - According to Dobereiner, elements having similar properties can be arranged in triads in which atomic mass of the middle element is the mean of the atomic masses of the other two elements.

Example – Mass of Na is 23 which is the mean of mass of Li = 7 and K = 39.

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