>>12049179The electrons do not fall into the nucleus because of a principle that I will refer to as universal gravitation. This means that all matter attracts all other matter in an inverse square relationship, so if something is twice as far away from another thing it will attract 4 times less than something 1/4 of the distance away. Without this force acting on protons and neutrons, they would collapse into each other immediately due to their electrical repulsion manifesting itself gravitationally.
Additionally, the reason the electrons do not fall into the nucleus is because of a principle that I will refer to as kinetic energy. This means that an object at rest tends to stay at rest until acted upon by another force, and an object in motion tends to stay in motion.
So the electrons do not fall into the nucleus because of universal gravitation, and they do not fall into the nucleus because of kinetic energy. These are fundamental laws in physics that cannot be broken.