Question

.) Describe doberiners trids with one example of trid​

Answer 1

Answer:

He arranged the three elements in a triad in an increasing order of atomic mass and showed that the atomic mass of the middle element was approximately equal to the mean of the atomic masses of the other elements. Examples : Lithium (Li), Sodium (Na), Potassium (K) from Dobereiner's tried.

Explanation:

I hope it's helpful for you

Please follow me

Answer 2

Answer:

A German chemist Johann Wolfgang Doberiners noted that there were group of elements with three elements known as triads in each group with similar chemical properties. He tried to give a relationship between the properties of elements and their atomic weights.

Dobereiner's Triads are groups of three elements arranged in such a way that the atomic weight of the middle element is almost the average of the other two. The elements of triad have almost similar properties.

Example:-

1) Sodium, Lithium, Pottasium

Here the atomic weights of Sodium, Lithium, Pottasium are 23.0 , 7.0 , 39.0

$\frac{7.0 + 39.0}{2} = 23.0$

Here the mean of weights of two elements is equal to other

Limitations ⬇️

• All the known elements at that time could not be arranged in the form of triads
• The law failed for very low mass and high mass elements. In case of F, Cl, Br the atomic weight of cl is not Arthematic mean of atomic weights of F and Br
• As the techniques improved for the measuring atomic masses accurately, the law was unable to remain strictly valid