What is the resonance structure for $C O_{3}^{- 2}$ $CO_3^-2$ ?

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What is the resonance structure for $C O_{3}^{- 2}$ $CO_3^-2$ ?

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Answer 1 · 2016-05-31T07:27:35

$C O_{3}^{2 -}$ $CO_3^(2-)$ $=$ $=$ $(O =) C {(- O^{-})}_{2}^{-}$ $(O=)C(-O^-)_2$

Explanation:

There are $4 + 6 + 6 + 6 + 2$ $4+6+6+6+2$ 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 $C - O$ $C-O$ bond has partial double bond character.

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What is the resonance structure for $C O_{3}^{- 2}$ $CO_3^-2$ ?

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