Final answer:
Resonance structures are multiple Lewis structures that show the same arrangement of atoms but different distributions of electrons, representing the delocalization in molecules like ozone (O3).
Step-by-step explanation:
Resonance structures are two or more Lewis structures drawn for a molecule that have the same arrangement of atoms but different arrangement of electrons. This concept is significant in the study of molecular chemistry where resonance forms help in understanding the actual electron distribution within molecules, recognized as a resonance hybrid. It is essential to note that each resonance structure depicts possible locations of electrons, and the real molecule is often a hybrid or an average of these structures. Resonance structures demonstrate the delocalization of electrons which is important in molecules like ozone (O₃) where the bonding can't be fully represented by a single Lewis structure.