Which of these particles do not have a charge?

Neutrons are subatomic particles found in the nucleus of an atom and are known for having no charge, making them electrically neutral. This property is crucial in maintaining the stability of atomic nuclei. Unlike protons, which carry a positive charge, and electrons, which carry a negative charge, neutrons do not interact with electromagnetic forces and thus do not contribute to the electrical charge of an atom.

Quarks, while also uncharged in certain configurations, always combine to form charged particles, such as protons and neutrons. Thus, in the context of individual particles, neutrons are the primary examples of charged particles, reinforcing the notion that they are crucial for the structural integrity of matter without influencing its overall charge balance.