Question #dc6d6

1 Answer
Jun 30, 2014

We can write three resonance structures for the thiocyanate ion, CNS⁻.

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Only the first two structures are important. We can ignore the third structure, because it has charge separation. There are formal charges on both N and S.

The resonance hybrid has the structure

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The negative charge is slightly greater on N than on S, because N is more electronegative than S.

Hope this helps.