What conditions stabilize a resonance ? Also what are possible resonance structure of nitrate ion ?
Resonance structures are imaginary. They represent extremes of electron location.
In general chemistry, the concept of resonance was introduced through inorganic anions such as NO3-, NO2-, ClO4-, SO42-, CO32-.
The curved arrow shows “movement” of a pair of electrons.
It’s an extremely useful accounting system that lets us keep track of changes in bonding and also in charge.
Since electron pairs are present either in bonds or in lone pairs, there are really only four combinations of “moves”.
The possible resonance structure of nitrate ion:
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