According to Hund's second rule, the spin tends to be maximal. That would, in my understanding, imply that, regarding the Stern-Gerlach experiment, the important electron in a silver atom has spin 1/2 (or "up"). This should hold for all atoms.
Every atom would have the same spin magnetic moment (smm) - because the smm points in direction of the spin - and thus be affected by the B-field just like any other atom.
But, if every electron has the same smm w.r.t. the magnetic field, why do we get two "blobs" on the screen and not just one "blob" above or below the z-axis?
Where is the error in my thought process?