Which subatomic particle is neutral and found in the nucleus of an atom?

The subatomic particle that is neutral and found in the nucleus of an atom is the neutron. Neutrons play a crucial role in the structure of an atomic nucleus, where they help to bind protons together through the strong nuclear force. This force is necessary because protons are positively charged and would naturally repel each other due to electromagnetic interactions. Neutrons, being neutral, do not have an electric charge and thus provide a stabilizing presence in the nucleus. Their presence ensures that the nucleus remains intact amidst the repulsive forces between protons.

In contrast, protons are positively charged and located in the nucleus, while electrons are negatively charged and orbit around the nucleus. Muons, while subatomic particles, are not typically found in stable atoms as they are unstable and decay into other particles relatively quickly.