How much negative charge is on each oxygen of the carbonate ion?

Applying this same method to the carbonate ion, we have 3 resonance structures with bond orders of 2, 1, 1 when considering the bond between carbon and a single oxygen.

Explanation:

CO32 - has three resonating structures. The way to calculate the bond order for most conpounds having resonating structures is: (No. of bonds/No. of resonating structures) Since, CO32 - has 4 bonds, Thus answer will be 4/3 or 1.3333 ...