What happens to the bond angle when you add or remove an electron domain

when you add the bond angle decreases and when you remove an electron domain the angle increases

Explanation:

Generally, character increase in the hybrid bond, the bond angle increases. Bond angle is affected by the presence or addition of lone pair of electrons at the central atom. Due to this, the bonds are displaced slightly inside resulting in a decrease of bond angle, and when you remove an electron domain the bond angle increases.