Which force determines the structure of atoms?

Atoms exist because negatively charged electrons are attracted to positively charged nuclei by the electromagnetic force. Quantum mechanics then determines the allowed electron states, or orbitals, around the nucleus. This force is also responsible for chemical bonding, electricity, and light. Without electromagnetism, there would be no stable atoms, molecules, or solid matter as we know it. It is one of the central forces in both physics and everyday life.