Question

what is basic difference between Mendeleev periodical table and modern periodical table

Answer 1

In the modern periodic table, the elements are arranged in order of increasing atomic number. (InMendeleev's table, they were arranged in order of increasing atomic weight). More elements are in the modern periodic tablewhich have been discovered sinceMendeleev's time.

Answer 2

There is a little difference between Mendeleev periodic table and modern periodic table that is : In mendeleev periodic table the elements are arranged in increasing atomic mass whereas In modern periodic table the elements are arranged with the atomic number.

The laws of mendeleev periodic table says that The properties of elements are a periodic function of their atomic masses.

The laws of modern periodic table says that The properties of elements are a periodic function of their atomic number.