Question

position of isotopes in the mendeleevs and modern periodic table

Answer 1

position of isotopes cannot be justified
according to the atomic weight different isotopes of an element should be given different places but it is not done so
hope it helps u

Answer 2

All isotopes of the same elements have different atomic masses but same atomic number. Therefore, they occupy the same position in the modern periodic table which they should have because all of them are chemically similar.