Hydrogen atom.

As we think about the fundamental forces, a key idea to grasp early on is that the chemical properties of substances are in large part determined by electrostatic forces. The forces between nuclei and electrons within atoms, the forces between atoms in chemical bonds, and the forces between molecules along lines of intermolecular force are all electrostatic forces. Basic classical physics is a foundation for understanding chemistry. We don't forget that quantum electrodynamics is necessary for a fuller picture while we begin a path to understanding chemical change by looking at the atom as a simple electrical system. We are building concepts in mechanics and electrostatics that will help you understand chemistry.

Electricity binds electrons in orbit to the nuclei of a single atom, and electricity binds atoms together in chemical bonds. Panning back the view further, electricity binds molecules together in a solid or liquid through intermolecular force. Electricity is the prime mover of chemical behavior. In learning chemistry, we will keep the classical electrodynamic picture as a valuable heuristic for understanding as we flesh things out with quantum mechanics.