In an atomic nucleus, neutrons and protons are held together by: ___________?
- A. Gravitational forces
- B. Exchange forces
- C. Coulombic forces
- D. Magnetic forces
Explanation
Protons and neutrons are bound inside the nucleus by the strong nuclear interaction, often described in older texts as an exchange force involving exchange particles. Gravity is far too weak at nuclear distances, while electric repulsion acts between protons.
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