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Assertion Actual atomic mass is greater than mass number. Reason Mass of protons and neutrons is measured in daltons or atomic mass unit (u) but the mass of each neutron and proton is slightly greater than 1 dalton

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

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

Solution

The assertion is true because atomic mass includes the actual measured masses of protons and neutrons, which are not exactly 1 u each. The reason is also true, but it does not fully explain why atomic mass is greater than mass number; it only states that nucleon masses are slightly more than 1 u.

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