Consider the resonance structures for the carbonate ion. (a)...

Consider the resonance structures for the carbonate ion.
(a) How much negative charge is on each oxygen of the carbonate ion?
(b) What is the bond order of each carbon-oxygen bond in the carbonate ion?

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Key Concepts

Bond Order

Bond order is a measure of the strength and stability of a bond, defined as the number of chemical bonds between a pair of atoms. In molecules with resonance, the bond order is determined by averaging the bond orders in all the resonance structures. This concept provides insight into bond length and bond energy, as bonds with higher order are typically shorter and stronger, reflecting an increased sharing of electrons.

Formal Charge

Formal charge is a bookkeeping tool used in Lewis structures to estimate the charge distribution within a molecule or ion. It is calculated based on the number of valence electrons an atom originally has versus the number of electrons assigned to it in the structure. This helps in identifying the most stable or significant resonance forms by evaluating which atoms bear minimal charge and more closely resemble their natural, uncharged state.

Resonance Structures

Resonance is a concept in which a molecule or ion is best represented by more than one valid Lewis structure. These different structures, known as resonance structures, depict various possible arrangements of electrons, particularly ? electrons and lone pairs, while the nuclei remain in fixed positions. The true electron distribution is a hybrid of these forms, leading to delocalization of electrons across the entire molecule or ion.

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