The acetate anion has two resonance structures of the same energy; one in which the π bond is on one oxygen, the other where it's on the other oxygen.
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Acetate ion (CH3COO-) has 2 resonance structures. The negative charge can be delocalized between the two oxygen atoms, resulting in two possible arrangements of the double bond within the molecule.
The nitrate ion, NO3^-, has 3 resonance structures.
To describe the structure of HNO3, two resonance structures are needed.
Nitric acid (HNO3) has 3 resonance structures. The delocalization of electrons between the nitrogen and oxygen atoms allows for the formation of different resonance structures.
There are three resonance structures of pyrimidines. These structures involve the delocalization of electrons within the aromatic ring of the molecule, leading to different arrangements of double bonds.
The chloride ion (Cl-) has only one resonance structure. The electron arrangement around the chloride ion is stable and not delocalized, so there is no need for multiple resonance structures.