Final answer:
The electromagnetic force prevents electrons from colliding with the nucleus of an atom by canceling out the attractive electric force and creating a stable minimum through orbiting electrons' magnetic forces.
Step-by-step explanation:
The force that prevents electrons from colliding with the nucleus of an atom is the electromagnetic force. This force is a combination of electrical and magnetic forces that act between charged particles. The attractive electric force of the surrounding electrons cancels out in all directions, leaving no net electric force. Additionally, the magnetic forces generated by the orbiting electrons create a stable minimum in which the nuclear charged particles reside, preventing the electrons from colliding with the nucleus.