What is the resonance structure for #CO_3^-2#?

1 Answer
May 31, 2016

Answer:

#CO_3^(2-)# #=# #(O=)C(-O^-)_2#

Explanation:

There are #4+6+6+6+2# valence electrons, i.e. 12 electron pairs to distribute over 4 centres. Of course, the resonance structure features 3 regions of electron density around a central carbon, and thus a trigonal planar structure. The oxygen atoms are all equivalent, and each #C-O# bond has partial double bond character.