Electrons are low-mass particles which carry a negative electrical charge. Neutrons have the same mass as protons, but they carry no charge. The fundamental forces of nature determine how these particles are arranged and how they interact with one another. An attractive force between any two masses . Like charges repel.
Opposite charges attract.
It bonds atoms together to form molecules, liquids, and solids. An attractive force between protons and protons or protons and neutrons. It is so strong that it can overcome the electromagnetic repulsion of proton vs. proton. The various combinations of protons and neutrons allowed by nature give rise to the various elements and their isotopes. The number of protons in an atomic nucleus determine the elemental identity of an atom.