Assertion :An elements nuclear charge is equal to the number of protons in the nucleus Reason: The only charged particles in the nucleus are neutrons

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 C Assertion is correct but Reason is incorrect
Protons and neutrons are present in the nucleus and both are collectively called nucleons. Protons are charged particles and neutrons are neutral or do not have any charge on them. So total charge on the nucleus is due to the number of protons present in the nucleus.
Hence, the assertion- An elements nuclear charge is equal to the number of protons in the nucleus is correct.
The only charged particles in the nucleus are neutrons is incorrect statement.
Hence, option $C$ is correct.

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