He would probably say “you are right; the Heisenberg uncertainty principle means that you cannot know both the electrons position and momentum exactly due to quantum uncertainty”
Continuously, but always in a new unpredictable direction, i.e. Brownian motion.
And I suppose if you keep measuring them fast enough, so much disturbance will kick them off the atom, so they are no longer in the shell. The shell is what happens when the electrons are left alone. (Not completely sure about this part.)
