Question

explain the limitations of law
of Dobereiner's triads.​

Answer 1

Answer:

Two important limitations are:

 

All known elements could not be classified into groups of triads on the basis of their properties .

 

Not all groups obeyed the Law of Triads. For example, nitrogen family does not obey the Law of Triads.

Answer 2

Limitations of Dobereiner's triads:

• He could classify the elements only into 3 triads.
• He was not able to prepare triads for all known elements which were present at that time.

KNOW MORE:

Characteristics of Dobereiner's triads:

• Elements which had similar chemical properties were placed in the same group.
• He arranged elements on the basis of their increasing order of atomic masses.
• He arranged elements such that the sum of atomic masses of first and last elements was approximately the average of middle element.

Example:

Lithium → 7

Sodium → 23

Potassium → 39

Atomic mass of Sodium = (7 + 23) ÷ 2 which is approximately equal to 23.