Question

Differentiate between Modern periodic law and Mendeleev's periodic law

Answer 1

Mendeleev's periodic table	Modern periodic table
Mendeleev's periodic table has 8 vertical columns called groups and 12 horizontal row called as periods	The modern periodic table has 18 columns called groups and seven rows called periods
The table orders the elements based on their atomic weight	The table orders the elements based on their atomic number
Mendeleev's periodic table had gaps for the missing elements at that time	The modern periodic table has no such gaps.
Mendeleev's periodic table has elements with dissimilar properties in the same group sometimes	modern periodic table have similar properties repeated at regular intervals
Mendeleev's periodic table doesn't support the fact of the existence of isotopes	The modern periodic table supports this fact as the classification is based on atomic number