Question

What is the difference between mendeelev periodic table and modern periodic table

Answer 1

Mendeleev's periodic table is based on atomic mass
Modern periodic table is based on atomic number
In Mendeleev's periodic table noble gases were not placed (as they are not discovered at that time).
.In Modern periodic table noble gases in a seperate group named as group-18
.In Mendeleev's periodic table transition elements included with other elementsIn Modern periodic table transition elements placed in separate block.