Identify the term being defined.

strong electrostatic forcestrong nuclear forcestrong centripetal forcegravitational attractions the force that keeps the nucleons bound inside the nucleus of an atom

nuclide transfer energynuclear binding energymass-energy equivalencenuclear energy the amount of energy needed to split the nucleus into individual protons and neutrons

mass of nucleusmass defectatomic massisotopic mass the difference between the mass of the nucleons and the mass of the atom