Question

Why was the method of classification, suggested by Dobereiner, discarded?

• A. The weights were wrongly calculated
• B. Many elements were unknown at that time
• C. Only three triads were formed from the elements known at that time
• D. None of the above

Answer 1

Answer: (C)

Only three triads were formed from the elements known at that time

The method of classification suggested by Dobereiner was discarded because, out of the elements known at that time, only three triads were formed. The groups could not be formed of other elements.

Hence, the correct option is $\text{C}$