We often read that atoms are mostly empty space. A common example is given as, if the atom was a big as a football stadium the nucleus would be as big as a tennis ball on the center and nearest electrons circling around at far side of seats or something like that. How does this reconcile with the fact that first orbit of electron is "s" and it has a shape of sphere; the electron occupying a "s" orbit can be anywhere in this orbit determined by quantum mechanics? The orbit is actually an probability function of where you might find an electron if you want to calculate it. If nucleus is so small surrounded by "s" orbit, how can we say that nearest electrons are far far away? Doe it mean electrons mostly occupy outer shell of this sphere? rarely travelling close to nucleus?