Assertion (A): Mendeleev failed to explain the position of isotopes in his periodic table.
Reason (R) : Isotopes have different atomic mass.

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Solution

Mendleves classified the elements on the basis of increasing atomic masses. So accordingly isotopes should have been assigned different positions but in his table there was no position assigned for isotopes. So it became the limitation of his periodic table that he was not able to explain the position of isotopes.

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Assertion (A): Mendeleev failed to explain the position of isotopes in his periodic table.​ Reason (R) : Isotopes have different atomic mass.​

Assertion (A): Mendeleev failed to explain the position of isotopes in his periodic table.
Reason (R) : Isotopes have different atomic mass.