The nuclei of most atoms contain multiple protons. Each proton has a positive charge. If objects that have like charges repel each other, why do the protons in the nuclei of most atoms not fly apart?

Protons electrically repel one another because they have like charges. At the very short distances inside a nucleus, however, the strong nuclear force attracts protons and neutrons strongly enough to hold the nucleus together. Neutrons have no electric charge, so they do not cancel the protons’ charges; the correct choice is C, the strong nuclear force holds the nucleus together.

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