Answer :
a Resonance structure is the Lewis structure of every atom in the molecule, that gives one Lewis structure. But they called it resonance structure to have a change.
There is 7 resonance structures for SO3, like the images below:
There is 7 resonance structures for SO3, like the images below:
![View image SoapyMcTavish](https://us-static.z-dn.net/files/dd4/249dd1d644436499fe132b7531c32425.jpg)
![View image SoapyMcTavish](https://us-static.z-dn.net/files/d73/69973ecbff100354f85d5a0d8bf584a1.jpg)