I don't think we understand enough about the dark energy driving inflation to say that. If the force is constant for a given pair of particles at a constant di

I don't think we understand enough about the dark energy driving inflation to say that. If the force is constant for a given pair of particles at a constant distance, and the atoms are currently stable, that would seem to imply that the force from dark energy pushing the atoms apart will be the same as they are now. However, as I said, I don't think we know enough about dark energy to say anything about its effects on the atomic scale either now or eons hence.