Question

part 3 of 3
identify the most important resonance structure. select the single best answer.
: n≡n—s:
: n=n=s:
: n—n≡s:

Explanation:

The most important resonance structure is the one with the least formal - charge separation and with negative charges on the more electronegative atoms. Nitrogen is more electronegative than sulfur. In the structure :N≡N—S:, the formal - charge distribution is more favorable compared to the others. The first structure has a triple - bond between the two nitrogen atoms which is a strong bond and the negative charge is on the more electronegative nitrogen atom. In the second structure, there is more charge - separation and in the third structure, the negative charge is on the less electronegative sulfur atom.

Answer:

:N≡N—S: