Pi electron delocalization

[Kayla Cho 2C]

How does the delocalization of π electrons in resonance structures affect the molecular geometry, specifically for So3?

[Jayden Lee 2F]

Hello ! When SO3 has delocalized π electrons, it spreads out the electron density evenly over all three bonds, so they end up the same length. This makes the molecule perfectly balanced in a flat, triangle shape and more stable overall. Hope this helped !