Here are the essential concepts you must grasp in order to answer the question correctly.
Resonance Structures
Resonance structures are different Lewis structures for the same molecule that depict the delocalization of electrons. They are used to represent the actual electronic structure of a molecule more accurately, as the true structure is a hybrid of these contributors. Each resonance structure must obey the rules of valence and should not violate the octet rule for second-row elements.
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Major and Minor Contributors
In resonance theory, major contributors are those resonance structures that are more stable and thus have a greater influence on the resonance hybrid. Factors such as the presence of formal charges, electronegativity, and the octet rule determine the stability of these structures. Minor contributors, while still valid, are less stable and contribute less to the overall hybrid structure.
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Resonance Hybrid
The resonance hybrid is the actual structure of a molecule that is a weighted average of all its resonance contributors. It reflects the delocalization of electrons across the molecule, leading to increased stability. The resonance hybrid cannot be represented by any single resonance structure, and its properties are often intermediate between those of the individual contributors.
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