# What is the O-S-O bond angle in a SO_3 molecule?

Mar 6, 2017

$\angle O - S - O = {120}^{\circ}$.
Given the normal assumptions of VESPER, we have $4 \times 6 = 24$ $\text{valence electrons}$ to distribute around 4 centres.
A Lewis structure of $O = {S}^{2 +} {\left(- {O}^{-}\right)}_{2}$ is commonly invoked, even tho $S {\left(= O\right)}_{3}$ is structurally identical. Can you apportion the 24 valence electrons in the given $O = {S}^{2 +} {\left(- {O}^{-}\right)}_{2}$?