Blast Off into the Cosmos: 2026 Extraterrestrial Life Exam 1 Practice Challenge!

Electromagnetic forces hold atoms together. The negatively charged electrons are attracted to the positively charged protons in the nucleus by the electrostatic (Coulomb) force. This attraction creates the stable electron cloud that surrounds the nucleus and keeps the atom bound as a whole. The strong nuclear force is what binds protons and neutrons inside the nucleus itself, not the entire atom, and gravitational forces are far too weak to matter at atomic scales. Neutrons have no net charge, so magnetic attraction isn’t what binds electrons to the nucleus. Therefore, the binding force between protons in the nucleus and the surrounding electrons—the electrostatic attraction—is the correct description.