Question

Mention two problems which are unresolved in the original Mendeleev

periodic classification​

Answer 1

Explanation:

According to Mendeleev's Periodic Law, isotopes of an element must be given separate places in the periodic table because they have different atomic masses. It does not explain the electronic arrangement of elements. Elements that are chemically similar such as Gold and Platinum have been placed in separate groups.

Answer 2

Answer:

1. Isotopes couldn't be placed in Mendeleev's table.

2.Some elements having lower atomic mass were placed after the

element having higher atomic mass.