Why do isotopes occupy the same position in the periodic table?

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Solution

Isotopes:
Isotopes are the elements that have the same atomic number but different atomic mass.
In the modern periodic table, elements are arranged in the increasing order of atomic number.
Since isotopes have the same atomic number. So, all the isotopes of an element must occupy the same position in the periodic table.
Example: Isotopes of hydrogen ${}_{1}^{1}H$ (Hydrogen) , ${}_{1}^{2}H$ (Deuterium) , ${}_{1}^{3}H$ (Tritium)
Thus, they occupy the same position in the periodic table.

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