How would the stability of the nucleus be affected if it were composed of only protons?

If the nucleus were composed solely of protons, its stability would be significantly compromised. Protons are positively charged and repel each other due to electromagnetic forces, leading to an unstable configuration without the presence of neutrons, which provide the necessary strong nuclear force to offset this repulsion. Neutrons help to bind protons together within the nucleus, so a nucleus made entirely of protons would likely disintegrate due to this repulsive force. Consequently, such a nucleus would not be stable and would not exist in nature.