question_answer

The electrons, identified by quantum numbers n and 1(i) n = 4, 1 = 1 (ii) n= 4 , 1 = 0 (iii) n = 3, 1 = 2 (iv) n = 3, 1 = 1 can be placed in order of increasing energy, from the lowest to highest, as

A) (iv)<(ii)<(iii)<(i)

B) (ii)<(iv)<(i)<(iii)

C) (i)<(iii)<(ii)<(iv)

D) (iii)<(i)<(iv)<(ii)

Correct Answer: A

Solution :

[a] According to the (n +1) rule the higher the value of (n + 1), the higher is the energy. When (n +1) value is the same see value of n. \[\therefore \,\,\,\,\,\,\,\,iv<ii<iii<i\]