Lewis Structures: Non-equivalent Resonance Structures

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There are three resonance structures one can draw where the octet rule is satisfied for all the atoms of the polyatomic ions SCN. These three resonance structures are shown below.

a) On the Resonance Structures draw curved arrows that show how one could go from Resonance Structure 1 to 2 and Resonance Structure 2 to 3.

b) Which of the structure(s) would you identify to be the best Lewis structure(s)? Explain your reasoning.
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