Resonance Structures
Resonance Structures - Related Videos
02:18
Resonance and Hybrid Structures
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2026
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.Resonance Structures and Resonance HybridsThe Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.If nitrite ions contain a single and a double bond, the two...
02:52
Resonance
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2020
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. If nitrite ions do indeed contain a single and a double bond, the two bond lengths are expected to be different. A double bond between two atoms is shorter (and stronger) than a single bond between the same two atoms. However, experiments show that both N–O bonds in NO2− have the same strength and length, and are identical in all other...
14:55
Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Cited by 3 •
2017
Structures of supramolecular protein assemblies at atomic resolution are of high relevance because of their crucial roles in a variety of biological phenomena. Herein, we present a protocol to perform high-resolution structural studies on insoluble and non-crystalline macromolecular protein assemblies by magic-angle spinning solid-state nuclear magnetic resonance spectroscopy (MAS SSNMR).
12:56
Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering (CARS)
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Cited by 2 •
2010
A combination of three single wavelength short-pulsed lasers is used to generate coherent anti-Stokes Raman scattering (CARS) and doubly-resonant CARS (DR-CARS). The difference between these signals provides enhanced sensitivity for otherwise difficult to detect coherent Raman signals, enabling imaging of weak Raman scatterers.
08:16
High-resolution Structural Magnetic Resonance Imaging of the Human Subcortex In Vivo and Postmortem
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Cited by 5 •
2015
Here we present a protocol to determine the minimum number images that needed to be registered and averaged to resolve subcortical structures and test whether the individual layers of the LGN could be resolved in the absence of physiological noise.
FAQs
Electron delocalization distributes electron density across the atoms involved instead of confining it to one Lewis representation. The resulting resonance hybrid therefore provides a model for bond lengths that may not match any single contributing structure. This makes resonance analysis useful when connecting electron placement in Lewis drawings with experimentally observed molecular structure.
These features identify where alternative electron arrangements can be drawn without changing the atom framework. Moving π electrons, lone pairs, or formal charges can produce different valid Lewis representations, while the shared atomic arrangement remains constant. Comparing those placements helps explain how charge distribution and electron density contribute to stability and chemical reactivity.
No. The individual drawings are representations used to describe one resonance hybrid, not separate molecules undergoing rapid interconversion. The hybrid reflects delocalized electron density across the possible placements shown by the structures. This distinction prevents resonance diagrams from being interpreted as a time sequence and supports more accurate explanations of molecular behavior.
They show how electrons and formal charges may be distributed over a shared arrangement of atoms. The resonance hybrid then represents the combined delocalized electron density rather than selecting one drawing as the complete molecule. Chemists use this perspective to relate electron distribution to molecular stability, acidity, reactivity, and the behavior of charged species.
The arrangement and connectivity of the atoms must stay the same. Only the placement of relevant electrons, such as π electrons, lone pairs, or formal charges, changes between representations. Maintaining the atom framework ensures that the drawings describe resonance within one molecular system rather than different compounds, allowing their shared hybrid to be evaluated consistently.
Begin with a Lewis representation, then identify whether π electrons, lone pairs, or formal charges can be placed differently while preserving the same atom arrangement. Use the resulting alternatives together to interpret the resonance hybrid and its delocalized electron density. This workflow connects a two-dimensional electron description with predicted stability, geometry, bond lengths, and reactivity.
Resonance analysis is especially relevant to ozone, carbonate, benzene, and amide groups. In each case, alternative electron placements help connect Lewis representations with the compound’s broader electronic description. These examples show that the concept applies across molecules and ions and can support explanations of bond lengths, charge distribution, molecular geometry, stability, acidity, and reactivity.
By representing electron density as delocalized across valid alternatives, resonance analysis links Lewis structures to observable and chemically useful properties. It can help explain why a species has particular molecular stability, bond lengths, geometry, acidity, or reactivity. In chemistry research and instruction, this makes resonance a bridge between electron bookkeeping and molecular behavior.