system
Given the following post, respond as if you're commenting on Reddit:
human
Does Expansion of the Universe Happen On Atomic Levels?

I understand that all large bodies of the universe have been expanding from eachother in distanfe since the beginning of time and that eventually it will all be so far apart that nothing new can be formed. 

Does this happen on a molecular level too? 
Will each atom eventually spread itself so far out from every other atom that nothing is bonded anymore, or do laws of gravity affect that?
gpt
Nope. Definitely not.

It's a very common misconception that the expansion of the Universe is provided by some "expansion force" which acts everywhere, and that gravity "acts against" this force in regions like our solar system.

That's nonsense. The only force relevant here, as far as we know, is gravity. The expansion occurs for more pedestrian reasons - because of something analogous to inertia. That is, at some initial time space was expanding (say, because of the big bang), and because there was nothing to *stop it*, it kept on going. The expansion then proceeded, under the influence of gravity. For the first few billion years, this meant that the expansion slowed down, like a ball thrown in the air slows down on its way up. (It's speeding up now, which means there's something funny going on, but that's a topic for another time!)

But does this mean that the protons and electrons in an atom are expanding away from each other? Well, no, because they're held together by atomic forces. Even if they were initially expanding away from each other, those forces pull them in together, and once that happens, there's no longer any "residual expansion" because there is no expansion force.