Predict the molecular structure for each of the following....

Predict the molecular structure for each of the following. (See Exercises 89 and $90 .$ ) a. $\mathrm{BrFI}_{2}$ b. $\mathrm{XeO}_{2} \mathrm{~F}_{2}$ c. $\mathrm{TeF}_{2} \mathrm{Cl}_{3}^{-}$ For each formula there are at least two different structures that can be drawn using the same central atom. Draw all possible structures for each formula.

Predict the molecular structure for each of the following. (See Exercises 89 and $90 .$ )
a. $\mathrm{BrFI}_{2}$
b. $\mathrm{XeO}_{2} \mathrm{~F}_{2}$
c. $\mathrm{TeF}_{2} \mathrm{Cl}_{3}^{-}$
For each formula there are at least two different structures that can be drawn using the same central atom. Draw all possible structures for each formula.

Key Concepts

VSEPR Theory

VSEPR (Valence Shell Electron Pair Repulsion) theory is a model used to predict the geometry of molecules based on the repulsion between electron pairs—both bonding and lone pairs—around a central atom. The arrangement that minimizes these repulsions determines the overall molecular shape. This theory is central to predicting the structure of molecules with various substituents and lone pairs, and it provides a framework for understanding why different isomers can arise from the same formula.

Electron Domain Geometry and AXE Notation

Electron domain geometry, often expressed using the AXE notation, classifies molecules by the number of bonding pairs (X) and lone pairs (E) surrounding the central atom. This concept helps in assigning the idealized shape (such as tetrahedral, trigonal bipyramidal, or octahedral), and in predicting possible arrangements of substituents in cases where there are multiple ligand positions (like axial versus equatorial positions) that may give rise to different isomeric structures.

Ligand Positioning and Isomerism

The spatial arrangement of different ligands around a central atom can result in multiple, distinct isomers even when the overall geometry remains the same. The placement of ligands in positions of differing steric or electronic demands (e.g., axial versus equatorial positions in a trigonal bipyramidal structure) leads to variations in molecular structure. Understanding these differences is essential for predicting and rationalizing different possible structures from a single molecular formula.

Expanded Octet

Elements from period 3 and beyond have the ability to expand their octet, allowing more than eight electrons in their valence shell. This capability is important when predicting structures of molecules that involve central atoms bonded to many ligands, as it permits varied bonding environments and geometries. The concept is crucial in understanding the structures of compounds where central atoms, such as xenon or tellurium, accommodate additional substituents.

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