Question

Mendeleev's contribution to the concept of periodic table laid the foundation for the modern periodic table. Give reason.

Answer 1

Yes,mendeleev did hard work forperiodic tablehe divided into two sub groups A
AND B and periods.

Answer 2

Dmitri mendleev laid the foundation of the modern periodic table . He arranged all the 63 elements known at that time on the basis of increasing mass number. He predicted some elements. He laid down the periodic properties.