Select the incorrect statement out of the following for Dobereiner triads

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Dobereiner triad forms a group of three elements.

Atomic mass of the middle element is average of other two.

Properties of the middle element are midway of the other two.

All elements could be classified in the system

answer is D.

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Detailed Solution

Only a total of 5 Dobereiner's triads were identified. Even several known elements did not fit into any of the triads.