Here's why:
* Electric Repulsion: Protons, being positively charged, experience a strong repulsive force due to the electromagnetic interaction. This force tends to push them apart.
* Strong Nuclear Force: The strong nuclear force is a fundamental force in physics that operates only at extremely short distances, on the scale of atomic nuclei. It is much stronger than the electromagnetic force, and it's responsible for holding protons and neutrons together in the nucleus of an atom.
* Balancing Act: Within the nucleus, the strong nuclear force overcomes the electromagnetic repulsion between protons, keeping the nucleus stable.
Key Points:
* The strong nuclear force is a very short-range force.
* It is the strongest of the four fundamental forces in nature (strong nuclear, weak nuclear, electromagnetic, and gravitational).
* Without the strong nuclear force, atoms would not exist, and neither would matter as we know it.