Question

How many equal resonating structure of sulphate? Draw all structure.
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Answer 1

It actually has 6. If you draw out the S with 4 oxygens bonded to it, 2 of those oxygens have double bonds, the other two carry an anionic charge.

Hold one double bond still and move the other to the remaining two oxygens and you have 3 resonance structures. Now hold another double bond "still" and move the bond again, make sure not to double-count anything. Continue doing this until the end. You should get 6 if you did it right. It helps to draw it out.

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