Question

What are the drawbacks of the law of Dobereiner Triad ?

Answer 1

The drawback of Dobereiner's triads:

• The main Limitation of Dobereiner's classification of elements was that he failed to arrange all the then-known elements in the form of triads of elements having similar chemical properties.
• Dobereiner could identify only three triads. He was not able to prepare triads of all the known elements
• For very low mass or for very high mass elements, the law was not holding good. Take the example of F, Cl, Br. Atomic mass of Cl is not an arithmetic mean of atomic masses of F and Br.