Question

Differentiate between the arrangement of elements in Mendeleev’s periodic table
and Modern periodic table.

Answer 1

mendeleev periodic table were arranged according to aromic weight
nd modern table was based on atomic number

mendeleev periodic table had 8 groups
modern table had 18 grp

Answer 2

In Mendeleev's periodic table elements where arranged according to their atomic mass.
In Modern Periodic table elements are arranged according to their atomic number.