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A valence bond theory approach considering just s and p orbitals would describe the bonding in terms of resonance between two resonance structures. Two resonance structures of sulfur dioxide. The sulfur–oxygen bond has a bond order of 1.5. There is support for this simple approach that does not invoke d orbital participation. [11]
Contributing structures of the carbonate ion. In chemistry, resonance, also called mesomerism, is a way of describing bonding in certain molecules or polyatomic ions by the combination of several contributing structures (or forms, [1] also variously known as resonance structures or canonical structures) into a resonance hybrid (or hybrid structure) in valence bond theory.
Expressing resonance when drawing Lewis structures may be done either by drawing each of the possible resonance forms and placing double-headed arrows between them or by using dashed lines to represent the partial bonds (although the latter is a good representation of the resonance hybrid which is not, formally speaking, a Lewis structure ...
A valence bond structure resembles a Lewis structure, but when a molecule cannot be fully represented by a single Lewis structure, multiple valence bond structures are used. Each of these VB structures represents a specific Lewis structure. This combination of valence bond structures is the main point of resonance theory.
In such complexes, SO 2 is classified as a pure Lewis acid. The structure is similar to that for conventional Lewis base adducts of SO 2. η 2-SO 2. Both S and one O centre are attached to the metal. The MSO 2 subunit is pyramidal at sulfur. This bonding mode is more common for early metals, which are typically strongly pi-donating. η 1-SO 2 ...
Below is an example of how NRT may generate a list of resonance structures. (1) Given an input wavefunction, NRT creates a list of reference Lewis structures. The LEWIS option tests each structure and rejects those that do not conform to the Lewis bonding theory (i.e., those that do not fulfill the octet rule, pose unreasonable formal charges ...
The structure of the sulfite anion can be described with three equivalent resonance structures. In each resonance structure, the sulfur atom is double-bonded to one oxygen atom with a formal charge of zero (neutral), and sulfur is singly bonded to the other two oxygen atoms, which each carry a formal charge of −1, together accounting for the ...
Computational chemistry has found that an expanded d-orbital model is not a very stabilising interaction and therefore not an important contributor to bonding in SO2, hence its omission in this image. Date: 3 September 2012, 03:42 (UTC) Source: This file was derived from: Sulfur-dioxide-resonance-2D.png: Author: Sulfur-dioxide-resonance-2D.png ...