The mass defect in a particular nucleus is?

The mass defect in a particular nucleus is (check all that apply)
1- the experimental error in determining the nuclear mass.
2- the difference between the calculated and the experimental nuclear mass.
3- the difference between the mass of the protons and the mass of the neutrons.
4- the mass that has been converted in to the nuclear binding energy.

Answer:
4 - binding energy

ref: http://en.wikipedia.org/wiki/binding_ene...
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