# What good is "VSEPR" in regard to the ozone, O_3, molecule?

Jun 10, 2017

Well it explains and rationalizes the molecular geometry of ozone.......

#### Explanation:

The typical Lewis representation of ${O}_{3}$ depicts charge separation, i.e. there are $3 \times 6 = 18 \cdot {e}^{-}$ deriving from the valence electrons of oxygen.

And thus our Lewis structure..........

$O = {\ddot{O}}^{+} - {O}^{-}$

Because there are THREE regions of electron density around the central oxygen, the geometry is based upon a trigonal plane. $\angle O - O - O = {120}^{\circ}$ to a first approx. Because the lone pair of electrons lies CLOSER to the oxygen atom it tends to compress the angle down from ${120}^{\circ}$. The actual $\angle O - O - O$ angles is about ${116.8}^{\circ}$. The $O - O$ bond lengths are equivalent, and $O - O = 1.27 \times {10}^{-} 10 \cdot m$, intermediate between $O = O$ ($1.24 \times {10}^{-} 10 \cdot m$) and peroxide ($1.49 \times {10}^{-} 10 \cdot m$).