Question

Why was the system of classification of elements into triads not found suitable ?

Answer 1

It was not applicable for all known elements but only to limited number of elements.

Answer 2

The system of classification of elements into triads was not found suitable because -

• The identification of new elements made this model useless.

• All the known elements could not be arranged as Triads.
• It is not applicable to d and f-block elements.
• The newly discovered elements did not fit into the Dobereiner's triad.
• The law did not apply to the elements having low or high atomic mass.