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The first resonance structure is the most stable one: The charges are most balanced out in that structure with a -1 in the middle and two +1 ones on either side. The second one on the other hand is not as balanced because there is a more negative charge on the right side. The third one has the same problem but on the left side.
That is based on the formal charge which indicates gain or loss of electrons while forming covalent bonds. The formula is FC = V - (L + S/2). V is the valence electrons, L is the lone pair of electrons and S is the shared electrons.
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