Be sure to include all resonance structures that satisfy the octet rule. The Lewis structure consists of an S=O double bond and two S–O dative bonds without utilizing d-orbitals. This is one of the most pollutant chemical compounds in the gaseous form. Thus there needs to be one additional covalent bond with either of the Oxygen atoms, and since there are three of those, The SO3 molecule can be drawn in three different ways. SO3 == SO3 is represented by three resonance structures if only the octet rule is followed. The fourth resonance structure with three S=O bonds is noncontributory due to reasons beyond the scope of MCAT chemistry. It is also a primary agent in the acid rain. all of the above have one double bond coming off of the central atom--resonance is taking into account the fact that these double bonds can switch places. in these particular situations, because there are 3 atoms coming of the central atom, and because of the particular valence electrons there are (24 for each of the above), there happens to be 3 resonance structures. 5 years ago. Sulfur does not have an expanded octet in SO3, you don't need to know why. Sometimes, even when formal charges are considered, the bonding in some molecules or ions cannot be described by a single Lewis structure. In terms of electron-counting formalism, the sulfur atom has an oxidation state of +6 and a formal charge of 0. Each of them contributes equally, therefore it makes a third of a full contribution per bond, hence the bond order is expected to be about $1\frac13$. Using formal charges, we have one structure with three double bonds, which is closer to the observed bond order in SO3. Gaseous SO 3 is a trigonal planar molecule of D 3h symmetry, as predicted by VSEPR theory.SO 3 belongs to the D 3h point group.. Sometimes one Lewis Structure is not Enough. Resonance structure of the given molecule,(i) SO3 : Consider two hydrogen atoms A and B with electron e A and e B respectively. Draw the Lewis structure for the sulfur trioxide (SO_3) molecule. so3 does. There are three major resonance structures for SO3. So3 Resonance Structures. TeF2 == There is only one structure needed to represent TeF2. Most covalent molecules have a unique Lewis formula (dot structure), which explains the bonding in … Because O already has 6 valency shell electrons, it can only support up to two covalent bonds. Lv 4. Molecular structure and bonding. Still have questions? SeI2 == There is only one structure needed to represent SeI2. SO 3 stands for Sulfur Trioxide. co3 does. These are the equivalent structures where there exist one S=O bond and two S–O bonds. no3 does. The resonance is the description of the electronic structures or an ion by means of several schemes of the pairing of electrons, with the features of each scheme contributing to the description. We also see, that there is a $\pi$ bond in the first three structures. Source(s): https://shrink.im/a0GUn. Since all of the resonance structures are equally dominant, we can see that all of these bonds consist of a $\sigma$ bond. Lynne. Janice Powell July 21, 2017. It must be 7 because there are 3 structures with 2 single-bonded, 1 double-bonded; 3tructures with 1 single-bonded, 2 double-bonded, and 1 structures with 3 double-bonded. When the two hydrogen atoms approach each … 0 1. H A represents the nucleus of hydrogen atom A and H B represents the nucleus of hydrogen atom B. Lewis Structure SO3 Molecular Geometry, Lewis Structure, and Polarity Explained. 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