“It might be different if an atom were a simple solid piece of matter but it isn’t.”
We have known the Rutherford model of the atom is not accurate for some time, so why bother talking about atoms as if it were? It seems more accurate to say that “solid matter” is an effect produced by atoms, like an emergent phenomenon, and not an attribute of the atoms themselves.
If atoms are a quasi microcosm of the universe, maybe there’s some ‘dark matter’ in there?