Why best resonance structure is called the major contributor ?

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Why best resonance structure is called the major contributor ?

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Each of the structure is called a resonance contributor when we draw the Lewis structure for a molecule. Their structure differ just in the positioning of the electrons. The contribution structure which has the lowest energy and thus, most stable is the major contributor because the stable structures contribute the most to a resonance hybrid. The major contributor must have the most covalent bonds and most atoms of complete octet.

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