Which particle in an atom has no electrical charge?

In an atom, the particle that has no electrical charge is the neutron. Neutrons are found in the nucleus of an atom, alongside protons, and their lack of charge is significant in contributing to the stability of the nucleus. While protons carry a positive charge and electrons carry a negative charge, neutrons balance the forces within the atomic nucleus and help to hold it together through the strong nuclear force.

Understanding the role of neutrons is crucial in nuclear chemistry and physics, as variations in neutron numbers create isotopes of elements. This concept demonstrates the importance of neutrons in determining an atom's mass and stability without contributing to its charge.