Question #62e5a

1 Answer
Jan 6, 2018

#\text{SO}_3# has an incomplete octet; it has 12 electrons assigned to the central S atom instead of the typical 8.

Explanation:

The structure of #\text{CO}_2# is
https://www.youtube.com/watch?v=dD0Xl4acUFg

The central atom (carbon) has 8 electrons assigned to it, making it a full octet.

The structure of ICL is
https://www.youtube.com/watch?v=6AFiaxdu3Y0

Both iodine and chlorine have 8 electrons assigned to it, making both of them have a full octet.

The structure of #\text{SO}_3# is
http://geometryofmolecules.com/so3-lewis-structure-polarity/

The central atom (sulfur) has a total of 12 electrons assigned to it, so the central atom of #\text{SO}_3# has an incomplete octet.

The structure of #\text{O}_3# is
https://www.youtube.com/watch?v=O9D4wt_CQjo

Although #\text{O}_3# has resonance structures, the central atom in all of these resonance structures have 8 electrons assigned to it, making them have a full octet.