Question

Demerits of döbereiner traids

Answer 1

Answer:

1. All the elements at that time could not be arranged in the form of triads.
2. The law failed for very low mass or for very high mass elements. (In case of F,Cl,Br)
3. As the techniques improved for measuring atomic masses accurately, the law was unable to remain strictly valid.

Answer 2

Döbereiner could find only three triads.

i.e. total 9 elements only.