What is the charge of a neutron?

The charge of a neutron is neutral, meaning it has no electric charge. This is why the correct answer is 0. Neutrons are one of the three main particles found in an atom, alongside protons and electrons. While protons carry a positive charge (+1) and electrons carry a negative charge (-1), neutrons help to stabilize the nucleus of an atom without contributing any net charge. This unique property allows neutrons to play a critical role in the formation of atomic nuclei without affecting the overall charge of the atom.

Other options suggest a positive or negative charge, which is not accurate for neutrons, as they do not influence the electrical balance of an atom. The choice of +2 is also irrelevant since neutrons simply do not possess any charge at all.