What does the mass defect represent? A. The mass lost when an alpha particle is emitted from a nucleus
B. The uncertainty in nuclear mass resulting from quark
rearrangement
C. The amount of mass used up in holding a nucleus together
D. The difference between actual mass of the nucleus and average
isotope mass

C.) The amount of mass used up in holding a nucleus together.

Explanation:

The mass defect of a nucleus represents the mass of the energy binding the nucleus. It is the difference between the mass of the nucleus and the sum of the masses of the nucleons of which it is composed.

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