Question

In dobereiner classification of elements, the atomic weight of the middle element is equal to the mean of the atomic weight of the extreme elements.

• A. True
• B. False

Answer 1

The correct option is A True

1. The first classification of elements was done by Dobereiner.
2. Dobereiner arranges elements in increasing order of atomic masses.
3. Dobereiner classified elements into sets of three chemically similar elements called triads.
4. In triads, the mass of the middle element is the average of the top and bottom elements.

Therefore, the given statement is

“In Dobereiner's classification of elements, the atomic weight of the middle element is equal to the mean of the atomic weight of the extreme elements” is True.