How many energy equivalent resonance contributors are in Lewis structure of SO2?

The Lewis structure of sulfur dioxide (SO₂) has two main resonance contributors. These include one structure where sulfur has a double bond with each oxygen atom and another where one oxygen has a single bond with sulfur and carries a negative charge, while the sulfur has a positive charge. Both resonance forms contribute to the overall hybrid structure, which helps explain the molecule's actual bonding and properties.