Answer:
1). strong nuclear force 2). nuclear binding energy 3), atomic mass
Explanation:
1). The force that keeps nucleons together is known as nuclear force. This is a strong force with gravity playing a very minor role in this. 2). Nuclear binding energy is the energy needed to divide the nucleus of an atom into protons and neutrons. Mass deficiency is the difference between the expected mass and the real mass of the nucleus of the atom. The binding energy of the device will appear as an extra mass, which is the reason for this discrepancy. 3). Atomic mass is the weighted average mass of the element atom dependent on the relative natural abundance of the isotopes of that element. The mass number is the sum number of protons and neutrons in the nucleus of the atom.
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