Answer :

Isotopes - In certain elements, some atoms have the same atomic number but different atomic mass number. Such atoms of an element are called isotopes of that element.


Isotopes were discovered long time after the Mendeleev discovered periodic table.


As we know that the isotopes have different atomic masses but same chemical properties.


Thus, the isotopes of element are placed in the same place of that of the element instead of been given different place in modern periodic table for each isotope.

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