Lewis resonance structures

Although trioxygen (Ozone – O₃) may seem to satisfy octet rule, each one of two Lewis structures cannot account for the O₃ bond length. The Lewis structure for ozone (O₃) seems to satisfy the octet rule by placing a double bond between the central atom and one of the two end O atoms. In fact, we can put the double bond at either end of the molecule, as shown below.

However, neither one of these two Lewis structures accounts for the known bond lengths in O₃. Ozone experimental results showed bond length equal to 128pm which is shorter than O-O single bond and longer than O=O bond.

Instead, we can represent O₃ bonds by allowing the presence of the two structures (double arrows). The two resonance structures representing the Lewis structure occur at the same time.