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AP Chemistry
2.6 Resonance and Formal Charge
2.5 Lewis Diagrams
IntermediateMCQConceptual15.7k
Three Lewis structures are arranged horizontally from left to right, labeled 'Structure 1', 'Structure 2', and 'Structure 3'. Left (Structure 1): The label 'Structure 1' is above the structure. A sulfur atom symbol S is on the left, single-bonded with one horizontal line to a central carbon atom symbol C, which is triple-bonded with three parallel horizontal lines to a nitrogen atom symbol N on the right. The S atom has exactly three lone pairs of electrons (two dots above, two dots to the left, two dots below). The C atom has zero lone pairs. The N atom has exactly one lone pair (two dots to the right). The structure is enclosed in square brackets with a superscript negative sign '-' at the top right. Middle (Structure 2): The label 'Structure 2' is above the structure. An S atom is on the left, double-bonded with two parallel horizontal lines to a central C atom, which is double-bonded with two parallel horizontal lines to an N atom on the right. The S atom has exactly two lone pairs (two dots above, two dots below). The C atom has zero lone pairs. The N atom has exactly two lone pairs (two dots above, two dots below). The structure is enclosed in square brackets with a superscript negative sign '-' at the top right. Right (Structure 3): The label 'Structure 3' is above the structure. An S atom is on the left, triple-bonded with three parallel horizontal lines to a central C atom, which is single-bonded with one horizontal line to an N atom on the right. The S atom has exactly one lone pair (two dots to the left). The C atom has zero lone pairs. The N atom has exactly three lone pairs (two dots above, two dots to the right, two dots below). The structure is enclosed in square brackets with a superscript negative sign '-' at the top right. All elements and lines are rendered in grayscale on a white background. No other particles, labels, text, or annotations appear.
Three proposed Lewis structures for the thiocyanate ion, \(\text{SCN}^-\).
Three possible resonance structures for the thiocyanate ion, \(\text{SCN}^-\), are shown in the diagram below.

Based on formal charge principles and relative electronegativities, which of the following identifies the most stable Lewis structure for \(\text{SCN}^-\) and provides the correct justification?

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