Assertion :Isotopes have different atomic numbers. Reason: Isotopes must have different numbers of electrons.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Isotopes have same atomic number, same number of electrons and same number of protons. But isotopes have different mass numbers and different number of neutrons.
For example $_{17}^{35} C l$ and $_{17}^{37} C l$ are two isotopes of chlorine. $_{17}^{35} C l$ has 17 electrons, 17 protons and atomic number 17. It has 18 neutrons and mass number of 37. $_{17}^{37} C l$ has 17 electrons, 17 protons and atomic number of 17. It hs 20 neutrons and mass number of 37.

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