"You know that most of the stuff, most of the phenomenon we call MATTER, is just space," or the distance between cores. For example: if the electron shell of atom were the size of a football field, the proton/neutron nucleus would be the size of a flea on the 50-yard line! And that's a lot of a) space within and b) space without.
Atoms rarely 'touch'. They spend most of their time separated by quite enormous distance at ambient temperatures and pressures of space.