Question

predict the approximate bond angle in the molecule.

o(=o^+)-o^- (with lone pairs as shown in the image)

bond angle:

Explanation:

Step1: Identify central atom

The central atom is the positively charged oxygen ($\text{O}^+$).

Step2: Count electron domains

The central $\text{O}^+$ has: 1 double bond, 1 single bond, 1 lone pair. Total electron domains = 3.

Step3: Determine electron geometry

3 electron domains correspond to trigonal planar electron geometry, ideal bond angle $120^\circ$.

Step4: Adjust for lone pair

Lone pair-bond pair repulsion is stronger than bond pair-bond pair repulsion, so the bond angle is slightly less than $120^\circ$.

Answer:

Approximately $117^\circ$ (or slightly less than $120^\circ$)