The heavier halogens (Cl, Br, and I) form compounds in which...

The heavier halogens (Cl, Br, and I) form compounds in which the central halogen atom, $X$, is bonded directly to oxygen and to fluorine. Several examples are known, including those with formulas of the type $\mathrm{FXO}_{2}, \mathrm{FXO}_{3},$ and $\mathrm{F}_{3} \mathrm{XO}$. The structures of these molecules are all consistent with the VSEPR model. Draw Lewis structures and predict the geometries of (a) chloryl fluoride, $\mathrm{FClO}_{2}$; (b) perchloryl fluoride, $\overline{\mathrm{FClO}}_{3} ;$ (c) $\mathrm{F}_{3} \mathrm{ClO}$.

The heavier halogens (Cl, Br, and I) form compounds in which the central halogen atom, $X$, is bonded directly to oxygen and to fluorine. Several examples are known, including those with formulas of the type $\mathrm{FXO}_{2}, \mathrm{FXO}_{3},$ and $\mathrm{F}_{3} \mathrm{XO}$. The structures of these molecules are all consistent with the VSEPR model. Draw Lewis structures and predict the geometries of
(a) chloryl fluoride, $\mathrm{FClO}_{2}$; (b) perchloryl fluoride, $\overline{\mathrm{FClO}}_{3} ;$ (c) $\mathrm{F}_{3} \mathrm{ClO}$.

Key Concepts

VSEPR Theory

This theory (Valence Shell Electron Pair Repulsion) is used to predict the three?dimensional geometry of molecules by considering the repulsions between electron domains (bonding and non-bonding pairs) around a central atom. It provides a systematic way to determine molecular geometry based on the total number and arrangement of electron pairs, with the goal of minimizing electron–electron repulsions.

Lewis Structures

Lewis structures are diagrams that show the arrangement of electrons in a molecule, including bonding pairs and lone pairs, and help in visualizing the distribution of electrons among atoms. They are a fundamental tool for assessing molecular structure, calculating formal charges, and providing a basis for applying the VSEPR model.

Expanded Octet

This concept explains that atoms in the third period and beyond can accommodate more than eight electrons in their valence shells, due to the availability of d orbitals. This ability is essential for understanding hypervalent molecules where the central atom forms more than four bonds, such as in many oxyfluoride compounds of heavier halogens.

Molecular Geometry

Molecular geometry refers to the three-dimensional arrangement of atoms in a molecule, which is determined by the electron domain geometry predicted by the VSEPR model. It takes into account how bonding and lone pairs are positioned around the central atom to minimize repulsions, resulting in specific geometrical shapes.

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