Chapter 3, Problem 3.12P

Select from each set the molecule or ¡on having the smallest bond angle, and briefly explainyour choice:
a. ${\text{NH}}_{\text{3}},{\text{PH}}_{\text{3}}$ , or ${\text{AsH}}_{\text{3}}$

(halogen—sulfur—halogen angle)
b. ${\text{NO}}_{{\text{2}}^{-}}$ or ${\text{O}}_{\text{3}}$
c. ${\text{ClO}}_{{\text{3}}^{-}}$ or ${\text{BrO}}_{{\text{3}}^{-}}$