Confusion over the Lewis structure of the Nitrate ion,NO3-

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bryan966
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Why are some Lewis structures of NO3- are A(Image) and some are B(Image). What is the difference? Shouldn't it be B as N atom forms a dative bond with one of the O atoms? Thank you
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charco
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(Original post by bryan966)
Why are some Lewis structures of NO3- are A(Image) and some are B(Image). What is the difference? Shouldn't it be B as N atom forms a dative bond with one of the O atoms? Thank you
B is not a Lewis structure as it does not show all of the electron pairs.

B is one resonance form of the three possible electron arrangements. It is an approximation based on the older ideas of bonding.

In reality there is no difference between the nitrogen oxygen bonds. A more complete picture would show the three N-O bonds 120 degrees apart and equal in length (bond order = 1.33).
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Protoxylic
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2nd structure shows 1 resonance structure of the nitrate ion, of which there are 3. The large bracketed version is the resultant delocalised charge around the whole molecule, think of it as each oxygen atom having -1/3e charge (although that is not reality)
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bryan966
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Ahhh, I see
So, when we're asked to draw the Lewis structure for this specific ion. Should I include a dative bond arrow in it? Thanks a bunch.
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