Question

mendeleev contribution. laid the foundation of modern periodic table​

Answer 1

Answer:

In1869, Mendeleev made a periodic table consisting 67 elements while 63 were determined but 4 were undiscovered.

He also explained the periodic law which eases to study the periodic table.

Answer 2

Mendeleev had a great contribution in modern periodic table as-

1- he observed that elements with similar properties appeared at regular intervals.

2- he made easier to identify elements by dividing the table into rows and columns.

3- Mendeleev also observed that properties of elements changes while going from left to right.

This all made modern periodic table successful.