What is the original size of the atom?
There is actually a finite amount of energy an electron in an orbital can contain before it becomes disassociated from the nucleus. Like escape velocity from the earth, once some thing gets that much energy, it is no longer in orbit. So to compare to planets, in theory you could have an object in orbit around the earth, yet trillions of miles away. In practice you can’t for two reasons. First the object would be affected by the gravity of the sun and other planets. Second, even if you had an object far away from anything else, you would need to give the object a very precisely small amount of momentum, far to small to actually perform. The quantum equivalent of these reasons are, once an electron gets in a very high orbit, interactions with surrounding atoms ruin the orbit’s stability and indeed existence! But, even if you isolated an atom, high energy orbits are very unstable, hard to enter and crazy easy to leave! So an infinitely large atom would be infinitely difficult to create, s
