Question

What were the two achievement of mendeleev's periodic table

Answer 1

Answer:

The achievements by Mendeleev were: Mendeleev kept some blank spaces in the periodic table for the elements that were yet to be discovered. Eg:- Eka-aluminium, Eka-boron, Eka-silicon. He also predicted properties of some elements which were yet to be discovered.

Answer 2

Answer:

The two achievement of Mendeleev's Periodic Table are as follows :

1. Atomic masses of many elements were corrected on the basis of periodic table.
2. Noble gases were discovered very late because they are very inert and present in extremely low concentrations in atmosphere. When these gases were discovered later, they could be placed in a new group named zero group without disturbing the existing order.