In what way is the electronic configuration of the transition elements different from that of the non transition elements?

The d-block elements in the periodic table are called as transition elements.In the d-block,electrons are added to the penultimate shell,expanding it from 8 to 18 electrons.On the other hand in s- and p- block ,electrons are added to the outer shell of the atom,i.e in s- block the electron goes in outermost s- subshell and in p- it enters in p-subshell.In this way their configuration differs from non-transition elements.