Can electrons be found anywhere within the space described by a 3D orbital "90% of the time" (as stated in my textbook)? But that would mean they can be found right next to the nucleus or in the space of a lower energy level "90% of their time" (since the spheres and other shapes overlap starting right next to the nucleus).
We also know that electrons cannot jump from one energy level to another without absorbing or releasing energy and that they maintain a specific average distance from the nuceleus as denoted by a 2D depiction of their electron shells in the form of concentric circles (also written in the same textbook).
Even if they only skimmed the surface of the 3D spheres or dumbell shaped orbitals, the latter, e.g. a 2p orbital, still starts close to the nucleus while it should be farther away from the nucleus than a 1s orbital.
PS Thank you for your answers. But please elaborate on them since I did not understand at all. I just finished high school but am extremely curious and confused by the new information we are studying, and I want to understand...