Most often, electrons fill the decreased-Strength orbitals first, accompanied by the next better Electrical power orbital until finally it can be total, and so forth right until all electrons happen to be placed. Bohr's contributions to your review of quantum mechanics are endlessly memorialized in the Institute for Theoretical Physics https://un-kind.de/innovationen-in-der-bohrmaschinentechnologie-was-sie-wissen-mussen/