13- A possible set of quantum numbers for the last electron added to complete an atom of Potassium K in its ground state is:
a) n = 4 , l = 1 , ml = 0 , ms = - ½
b) n = 4 , l = 0 , ml = 0 , ms =+ ½ *
c) n = 4 , l = 0 , ml = -1 , ms = +½
d) n = 3 , l = 1 , ml = -1 , ms = +½
انا ماني فاهمة ايش الــ l والــ ml ??