Ncert Exercises & Solutions

Electronic configuration of four elements A, B, C and D are given below :

A. $1 s^{2} 2 s^{2} 2 p^{6}$

B. $1 s^{2} 2 s^{2} 2 p^{4}$

C. $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$

D. $1 s^{2} 2 s^{2} 2 p^{5}$

What is the correct order of elements based on their increasing electron affinity?

1.	A < C < B < D	2.	A < B < C < D
3.	D < B < C < A	4.	D < A < B < C