How many Lewis structures does CO₃²^- have?

Question

Quizplus · Accepted Answer

The molecule has a total of 36 valence electrons. The central atom, sulfur, will form single bonds with carbon and phosphorus, leaving 22 electrons for the remaining atoms (oxygen and phosphorus). It is impossible to satisfy the octet rule for all atoms in one Lewis structure, so resonance is necessary. A careful analysis of the possible resonance structures reveals that there are three major contributing structures. These have double bonds between sulfur and oxygen, and between phosphorus and oxygen. The formal charges on the atoms are minimized in these three structures, making them the most stable. Therefore, the molecule has three Lewis structures.

How Many Lewis Structures Does CO32- Have

How Many Lewis Structures Does CO₃²^- Have