Question

Note the electronic configuration of potassium and calcium given below:-

Electronic Configuration of Potassium = K(2) L(8) M(8) N(1)

Electronic Configuration of Calcium = K(2) L(8) M(8) N(2)

On the similar pattern explain why electronic configuration of next element scandium is K(2) L(8) M(9) N(2) and not K(2) L(8) M(8) N(3)?

Answer 1

because after M sub shell fully filled then after we should enter in to another sub shell so that scandium has k2 l8 m9 n2 or we can see the ground number of SC