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The Xenon dibromide Lewis structure is Xe–Br single bond and Xe–Br single bond; the central Xe has 5 electron domains (3 lone pairs), giving a trigonal bipyramidal electron-domain arrangement and a linear molecular geometry with a 180° bond angle. Xe is best described as sp3d-hybridized, and Xenon dibromide is nonpolar because the bond dipoles cancel by molecular symmetry.
Figure 1: Lewis Structure of Xenon dibromide (Br2Xe)
| Chemical Formula | Br2Xe |
| CAS Number | 73378-57-1 |
| Total Valence Electrons | 22 |
| Lewis Structure | Xe–Br single bond and Xe–Br single bond |
| Electron-Domain Geometry | trigonal bipyramidal |
| Molecular Geometry | linear |
| Hybridization Model | sp3d (central Xe) |
| Bond Angle | 180° |
| Polarity | Nonpolar molecule |
Noble-gas compounds such as Xenon dibromide 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 dibromide Lewis structure we first count the total valence electrons. Br2Xe contains 2×7 (Br) + 8 (Xe); the net charge of 0 gives a total of 22 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 = 2×7 (Br) + 8 (Xe) = 22 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–Br single bond and Xe–Br single bond; 3 lone pairs on Xe.
Counting bonding and nonbonding electrons around Xe therefore satisfies the octet/expanded-octet requirement for the drawn structure.
VSEPR theory states that the 5 electron domains around Xe arrange to minimize mutual repulsion, giving an trigonal bipyramidal electron-domain geometry.
Because 3 of these domains are lone pair(s) — and lone pairs repel more strongly than bonding pairs — the observed molecular geometry is linear; the Xe bond angle is set to 180° 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 3 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 (2 bonding + 3 lone pair).
Formal charge on central Xe = V − N − ½B = 8 − 6 − ½×4 = 0. The preferred Lewis structure carries zero formal charge on the central atom (and on the terminals), so it is the dominant contributor.
Xenon dibromide is nonpolar. Although individual Xe–terminal bonds are polar when the atoms differ in electronegativity, the linear geometry makes their vector sum zero, so there is no net molecular dipole.
A common misconception is that polar bonds guarantee a polar molecule. Xenon dibromide shows the opposite: identical bond dipoles arranged with linear symmetry cancel exactly, yielding a nonpolar species.
Interpretation consistent with standard VSEPR / molecular-geometry references.Its nonpolar character governs solvation and intermolecular behavior; specify grade and handling when sourcing.
| Species | Formula | Central Atom | Electron Domains | Molecular Geometry | Polarity |
|---|---|---|---|---|---|
| Xenon dibromide | Br2Xe | Xe | 5 | linear | Nonpolar |
| 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 dibromide is nonpolar. Its linear symmetry cancels the bond dipoles exactly.
Xe–Br single bond and Xe–Br single bond; 3 lone pairs on Xe. It uses all 22 valence electrons and the preferred structure carries zero formal charge on the central atom.
The Xe angle is about 180°. Lone-pair repulsion compresses the angle from the ideal trigonal bipyramidal value.
The conventional model is sp3d. Xenon dibromide has 5 electron domains around the central Xe.
The CAS number is 73378-57-1. PubChem (CID 3085953) and NIST identify this with Br2Xe; 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 73378-57-1 identifies the substance, not a universal purity specification.
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