Why are large amounts of energy required to separate a nucleus into protons and neutrons even though the protons experience electrostatic repulsion?

The answer would be that "the forces holding the nucleus together are much stronger than the repulsion between the protons".

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The force of the energy would have to be equal or more then the force of the proton and electrons

Ithink d hope that

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom