I recently asked a question about why relativistic effects come into play only with the superheavy elements. The top answer I got was pretty good and I understand most of it, but the answer brought up another question for me. The answerer said that the electrons move around their orbitals at .58c, but he gave a footnote for "moving that read:
Electrons are not "moving around" a nucleus, but they are instead probability clouds surrounding the nucleus. So "most likely distances of electrons" would be a better term.
Now this was not entirely new to me, I am aware of superposition where the particles occupy all of the points simultaneously. But, I am confused about the "most likely distances of electrons part", because there is some sort of speed given. After, a particle is observed and the waveform collapses, does it immediately revert back to the waveform and assume the superposition? Because, if this is the case, isn't velocity (speed and direction) meaningless? I mean if you measure a particle in one point with a given velocity, then it immediately changes, what good is it to know these properties? Or, did the observation somehow change the next calculated waveform?
Note: I am aware that the more accurately you measure a particle's momentum the less accurately you measure it's location. I am just uncertain as to how this plays a role here. Thanks for any clarification you could give.