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

Explanation

Transition elements contain incompletely filled d-subshell, i.e., their electronic configuration is `(n - 1) d^(1-10) ns^(1-2)` whereas non-transition elements have no d-subshell or their subshell is completely filled and have `ns^(1-2) or np^(1-6)` in their outermost shell