The total number of valence electrons, since we are now dealing with 3 O atoms, is up to
Lewis dot structures diagram the number of valence electrons outside of an atom. Since oxygen is in group VIA, it has six valence electrons that need to be accounted for when drawing its Lewis dot structure.
The reaction describes part of the ozone-oxygfen cycle (more here:http://www.theozonehole.com/ozonecreation.htm)
Here's a diagram of the Lewis structures for the reactans - top row - and for the product - bottom row -
Upper left side is where the LEwsi structure for
The upper right structure represents
The last two Lewis structures represent equivalent representations of the ozone (