CO32- has resonance structures, each C-O bond can resonate into a C=O.
Total valence electrons:
C 1 x 4 e- = 4 val. e-
O 3 x 6 e- = 18 val. e-
From -2 charge: add 2 e-
Total : 24 val. e-
The resonance structures of CO32- are:
Consider the following bond lengths:
C-O 143 pm
C=O 123 pm
C≡O 109 pm
In the CO32- ion, all three C-O bonds have identical bond lengths of 136 pm. Why?
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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl 2nd Edition practice problems.