Why do heavy nuclei contain more neutrons than protons?

Name: Why do heavy nuclei contain more neutrons than protons?
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Heavy nuclei contain a large number of protons, which repel each other due to their positive charge. By adding neutrons, which have no electric charge, but contribute to the mass of the nucleus, the electric repulsion of the protons is diluted, making the nucleus more stable. This is known as the neutron-proton ratio, which increases as atomic number increases.

Why Do Heavy Nuclei Contain More Neutrons Than Protons