in GENERAL when your doing the electron config for lets say a positive ion the electrons are lost from the sub shell with the HIGHEST energy
I know that there is an exception to this with chromium and copper that prefer to loose an electron from the 4s before loosing them from anywhere else
However I was looking at some stuff at the Internet and found that this is not just true for copper and chromium but for all the transition metals <<< is that true? (or may I have understood something wrong)
only need to know how to do this stuff for Z=36 so if there are other complications beyond here don't tell me lol