What do each of the following sets of compounds/ions have in...

What do each of the following sets of compounds/ions have in common with each other? See your Lewis structures for Exercises 91 through 94 . a. $\mathrm{XeCl}_{4}, \mathrm{XeCl}_{2}$ b. $\mathrm{ICl}_{5}, \mathrm{TeF}_{4}, \mathrm{ICl}_{3}, \mathrm{PCl}_{3}, \mathrm{SCl}_{2}, \mathrm{SeO}_{2}$

What do each of the following sets of compounds/ions have in common with each other? See your Lewis structures for Exercises 91 through 94 .
a. $\mathrm{XeCl}_{4}, \mathrm{XeCl}_{2}$
b. $\mathrm{ICl}_{5}, \mathrm{TeF}_{4}, \mathrm{ICl}_{3}, \mathrm{PCl}_{3}, \mathrm{SCl}_{2}, \mathrm{SeO}_{2}$

Key Concepts

Molecular Geometry

Molecular geometry describes the three-dimensional arrangement of atoms in a molecule, which is determined by the number and placement of bonding and nonbonding electron pairs around the central atom. Understanding molecular geometry is key to predicting chemical behavior and physical properties in various compounds.

Steric Number

The steric number is the sum of atoms bonded to a central atom and the lone electron pairs residing on it. It is a crucial factor in determining the electron-domain geometry and, by extension, the molecule’s overall shape according to VSEPR theory.

Expanded Octet

The concept of an expanded octet refers to the ability of elements in the third period and beyond to accommodate more than eight electrons in their valence shells. This arises due to the availability of d orbitals and allows for the formation of hypervalent molecules with unusual geometries.

VSEPR Theory

Valence Shell Electron Pair Repulsion (VSEPR) theory is a model used to predict the three?dimensional shape of molecules by considering the repulsions between electron pairs around a central atom. By minimizing these repulsions, the theory explains how both bonding and lone pairs determine the molecular geometry.

Lewis Structures

Lewis Structures are diagrams that depict the arrangement of electrons—including bonding pairs and lone pairs—in a molecule. They are essential for visualizing how atoms share or transfer electrons and serve as the basis for predicting molecular geometry and reactivity.

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