Question

what is triad? why is dobereiner's law of triads rejected?​

Answer 1

Answer:

Dobereiner's law of triads states that, the atomic mass of the middle element of a triad is the arithmetic mean of the atomic masses of the other two elements. Example: ... All the known elements could not be arranged in the form of triads. This law did not hold good for elements with very low or very high atomic mass.

mark as brainliest....

Answer 2

                               Dobereiner's Triads

Dobereiner classified elements into groups of three (triad) where "The Atomic Weight of the middle element was the Average of the other two elements"

Example : Ca (Calcium) , Sr (Strontium) , Ba (Barium)

• Atomic weight of Ca = 40 a.m.u

• Atomic weight of Sr = 88 a.m.u

• Atomic weight of Ba = 137 a.m.u

Here Middle Element is Sr

⇒ 88 = (40 + 137)/2  ⇒ 88 = 177/2 ⇒ 88 = 88

Merits : The main achievement of this classification is that it recognized a relationship between properties of elements and their atomic weights

Drawbacks of this classification : The Drawbacks of this classification of this classification are as follows :-

• Some elements which are dissimilar were being grouped into a triad
• There are many elements that cannot be grouped into triads was proposed by Dobereiner