Which particle has no electrical charge?

• A. Protons
• B. Neutrons
• C. Electrons
• D. Positrons

Answer: (B)

The neutron is electrically neutral. In atoms, the charges balance so that protons carry a positive charge and electrons carry a negative one, while a neutron has no net charge. This neutrality comes from its internal structure: it’s made of quarks in a combination that sums to zero charge. Because neutrons don’t add any charge, they don’t contribute to the atom’s overall electric field, though they do add mass and help hold the nucleus together by offsetting proton–proton repulsion. Protons are positively charged, electrons are negatively charged, and positrons are also positively charged (the antimatter counterpart of electrons). So the particle with no electrical charge is the neutron.