How modern periodic law removed the defects of mendeleevs system of classification?

The properties of elements are the periodic function of their atomic numbers.

REMOVAL OF DEFECTS OF MENDELEEV'S Periodic Table

periodic table obtained on the basis of increasing atomic numbers has removed defects of Mendeleev's periodic table .

1) POSITION OF ISOTOPES :

since the isotopes of the same elements have the same atomic number, they are given the same place in the table.

2) POSITION OF RARE EARTHS:

These elements are separately placed at the bottom of table . similarly Acton elements ( which were discovered after Mendeleev ) are also placed at the bottom of the periodic table.

3) ANOMALOUS PAIRS.

the arrangement according to the atomic number show that their placements are correct.