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The Xenon trioxide Lewis structure is Xe–O single bond, Xe–O double bond and Xe–O single bond; the central Xe has 5 electron domains (2 lone pairs), giving a trigonal bipyramidal electron-domain arrangement and a T-shaped molecular geometry with a ≈87.5° bond angle. Xe is best described as sp3d-hybridized, and Xenon trioxide is polar because the T-shaped shape (and/or unequal terminal atoms) prevents cancellation of the bond dipoles.
Figure 1: Lewis Structure of Xenon trioxide (H2O3Xe)
| Chemical Formula | H2O3Xe |
| CAS Number | 13776-58-4 |
| Total Valence Electrons | 28 |
| Lewis Structure | Xe–O single bond, Xe–O double bond and Xe–O single bond |
| Electron-Domain Geometry | trigonal bipyramidal |
| Molecular Geometry | T-shaped |
| Hybridization Model | sp3d (central Xe) |
| Bond Angle | ≈87.5° |
| Polarity | Polar molecule |
Noble-gas compounds such as Xenon trioxide are among the strongest known fluorinating and oxidizing agents. XeF2 is valued as a selective fluorinator and as a photoresist/oxide etchant in microelectronics, while the higher fluorides are used in fluorination and as powerful oxidizers. They react vigorously with water and organics and are handled only in passivated, rigorously dry systems.
To draw the Xenon trioxide Lewis structure we first count the total valence electrons. H2O3Xe contains 2×1 (H) + 3×6 (O) + 8 (Xe); the net charge of 0 gives a total of 28 valence electrons to place.
The central atom is Xe. It is the least electronegative atom capable of forming multiple bonds and is surrounded by the more electronegative terminal atom(s); hydrogen, when present, always occupies a terminal position. Electronegativity considerations place the electron density toward the terminal atom(s).
Total valence electrons = 2×1 (H) + 3×6 (O) + 8 (Xe) = 28 electrons.
Place Xe at the center and connect each surrounding atom with a single bond, complete octets on the terminal atoms, and place any remaining electrons on the central atom. The resulting electron distribution is: Xe–O single bond, Xe–O double bond and Xe–O single bond; 2 lone pairs on Xe.
Counting bonding and nonbonding electrons around Xe therefore satisfies the octet/expanded-octet requirement for the drawn structure.
This species is best represented by resonance structures; the π bonding is delocalized over the equivalent terminal atom(s), so all Xe–terminals bonds are equivalent in the resonance hybrid.
VSEPR theory states that the 5 electron domains around Xe arrange to minimize mutual repulsion, giving an trigonal bipyramidal electron-domain geometry.
Because 2 of these domains are lone pair(s) — and lone pairs repel more strongly than bonding pairs — the observed molecular geometry is T-shaped; the Xe bond angle is set to ≈87.5° rather than the ideal value for the electron-domain geometry.
A useful VSEPR approximation is: lone pair–lone pair repulsion > lone pair–bonding pair repulsion > bonding pair–bonding pair repulsion. With 2 lone pair(s) on Xe, the lone-pair domains occupy positions that minimize overall repulsion while pushing the bonding domains (and therefore the bonded atoms) closer together.
In the conventional localized-bond model, Xe uses sp3d hybrid orbitals to form the 5 equivalent electron-domain directions (3 bonding + 2 lone pair).
Formal charge on central Xe = V − N − ½B = 8 − 4 − ½×8 = 0. The preferred Lewis structure carries zero formal charge on the central atom (and on the terminals), so it is the dominant contributor.
Xenon trioxide is polar. The T-shaped shape prevents cancellation of the bond dipoles. The bond dipoles do not cancel, leaving a net molecular dipole, which strongly influences solvation behavior and intermolecular interactions.
The decisive structural fact is not simply that the individual bonds are polar; it is whether molecular symmetry allows their vector sum to vanish. In Xenon trioxide the T-shaped arrangement prevents cancellation, so a permanent dipole remains.
Interpretation consistent with standard VSEPR / molecular-geometry references.This polarity profile underpins its behavior as a solvent, reactant or process intermediate; when sourcing, specify grade and container compatibility.
| Species | Formula | Central Atom | Electron Domains | Molecular Geometry | Polarity |
|---|---|---|---|---|---|
| Xenon trioxide | H2O3Xe | Xe | 5 | T-shaped | Polar |
| Xenon difluoride | F2Xe | Xe | 5 | linear | Nonpolar |
| Xenon tetrafluoride | F4Xe | Xe | 6 | square planar | Nonpolar |
| Xenon hexafluoride | F6Xe | Xe | 7 | distorted octahedral (seven domains) | Polar |
Xenon trioxide is polar. Its T-shaped geometry (and/or unequal terminal atoms) stops the bond dipoles from cancelling.
Xe–O single bond, Xe–O double bond and Xe–O single bond; 2 lone pairs on Xe. It uses all 28 valence electrons and the preferred structure carries zero formal charge on the central atom.
The Xe angle is about ≈87.5°. Lone-pair repulsion compresses the angle from the ideal trigonal bipyramidal value.
The conventional model is sp3d. Xenon trioxide has 5 electron domains around the central Xe.
The CAS number is 13776-58-4. PubChem (CID 177839438) and NIST identify this with H2O3Xe; use it to locate suppliers and database records.
Technical scope: Lewis structures, VSEPR and hybridization are model-based descriptions for chemical communication and structure prediction; actual molecular electronic structure is more accurately represented by molecular-orbital and quantum-chemical methods. Commercial grades vary substantially by supplier and intended use; CAS 13776-58-4 identifies the substance, not a universal purity specification.
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