C. Why is the mass of a nucleus slightely less than the
mass of consistituent particles?
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The mass of an isolated proton has been measured to be 1.0073u and that of a neutron is 1.0087u (about 0.14% larger). The fact that C-12 nucleus has a mass slightly less than that of its 12 constituent particles indicates that some mass is lost (as energy, E=mc^2) when the particles are combined into a nucleus.
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Explanation:
The mass of the nucleus is always slightly less than the sum of the masses of its constituents protons and neutrons due to the fact that some energy is used up in binding constituent proton and neutrons together within a small volume of nucleus. ... As a result mass of nucleus is slightly less than its constituents.
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