Empty space
So if a proton is 0.8e-16m and a hydrogen atom is 5e-11m that means that the proton only takes up about 4e-13 % of the volume of the atom. That's a lot of empty space.
So if a proton is 0.8e-16m and a hydrogen atom is 5e-11m that means that the proton only takes up about 4e-13 % of the volume of the atom. That's a lot of empty space.