What are the limitations of Dobereiner triad?

1.	What are the limitations of Dobereiner triad?
Answer» 1. All the known elements could not be arranged in the form of triads. 2. The law failed for very low mass or for very high mass elements. Eg : In case of F, Cl, Br the atomic mass of Cl is not an arithmetic mean of atomic masses of F and Br. 3. As the techniques improved for measuring atomic masses accurately, the law was unable to remain strictly valid.

Answer»

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

2. The law failed for very low mass or for very high mass elements. Eg : In case of F, Cl, Br the atomic mass of Cl is not an arithmetic mean of atomic masses of F and Br.

3. As the techniques improved for measuring atomic masses accurately, the law was unable to remain strictly valid.

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What are the limitations of Dobereiner triad?

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