Which fundamental force keeps protons and neutrons bound inside the atomic nucleus?
Quick Answer
The strong force, in its residual nuclear form, binds protons and neutrons together in nuclei. Without it, positively charged protons would repel each other and nuclei would not exist.
The Full Story
Inside a nucleus, protons repel one another because they all carry positive charge. The residual strong nuclear force overcomes that repulsion at extremely short distances and binds nucleons together. This is why hydrogen is the only atom that can exist with just one proton, while heavier nuclei need both protons and neutrons to remain stable. The same underlying strong interaction also binds quarks into protons and neutrons. Nuclear binding energy is what powers both the Sun's fusion and nuclear reactors on Earth.
Key Facts
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Suggested video title for this topic:
"Why doesn't the nucleus fly apart? A force stronger than electric repulsion."
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