Compared to the masses of its separate protons and neutrons, the total mass of a stable nucleus is always
A)less.
B)the same.
C)greater.
D)zero.
E)varies from atom to atom.

Question

Quizplus · Accepted Answer

The total mass of a stable nucleus is always less than the sum of the masses of its separate protons and neutrons due to the binding energy, which is released when the nucleus is formed. This mass difference is known as the mass defect.

Compared to the Masses of Its Separate Protons and Neutrons