Which of the following particles has no charge?

The particle that has no charge is the neutron. Neutrons are subatomic particles found in the nucleus of an atom alongside protons, and they are characterized by the absence of an electric charge. This neutrality allows them to contribute to the mass of the atom without affecting the atom's overall charge, which is determined by the number of protons (positively charged) and electrons (negatively charged).

In contrast, cations are positively charged ions that occur when an atom loses one or more electrons. Protons are positively charged particles located in the nucleus of an atom, playing a crucial role in defining the atom's identity and its positive charge. Electrons are negatively charged particles that orbit the nucleus and balance the positive charge of protons to create a stable atom. Therefore, the neutral charge of neutrons is what distinguishes them and makes them the correct choice in this question.