Why was Dobereiner's triad discarded?

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Solution

Dobereiner’s law of triads failed for the following reasons :

All the then known elements could not be arranged in the form of triads.

For very low mass or for very high mass elements, the law was not holding good.
Example: F, Cl, Br. Atomic mass of Cl is not an arithmetic mean of atomic masses of F and Br.

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