Ncert Exercises & Solutions

3.39 Considering the elements B, C, N, F, and Si, the correct order of their non-metallic character is :

(a) B > C > Si > N > F

(b) Si > C > B > N > F

(d) F > N > C > Si > B

The non-metallic character of elements increases from left to right across a period. Thus,

the decreasing order of non-metallic character is F > N > C > B.

Again, the non-metallic character of elements decreases down a group. Thus, the

decreasing order of non-metallic characters of C and Si are C > Si. However, Si is less

non-metallic than B i.e., B > Si.

Hence, the correct order of their non-metallic characters is F > N > C > B > Si.