So this negative atom can be distributed to this oxygen and then this oxygen. And that happens when this guy forms a double bond, displacing this bond, forming a negative bond here. And then this lone pair forms a double bond with this bond, displacing this lone pair, creating a negative charge here. In fact, a fourth resonance stabilized state exists in which three double bonds exist, and the CL atom has a negative charge. So we see that resonance stabilization is good. Whenever we have more resonance stabilization, that means we have a more stable conjugate base.