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Ch.10 - Chemical Bonding II: Molecular Shapes & Valence Bond Theory
Chapter 10, Problem 35

Determine the electron geometry, molecular geometry, and idealized bond angles for each molecule. In which cases do you expect deviations from the idealized bond angle? a. PF3 b. SBr2 c. CHCl3 d. CS2

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

VSEPR Theory

Valence Shell Electron Pair Repulsion (VSEPR) Theory is a model used to predict the geometry of individual molecules based on the repulsion between electron pairs in the valence shell of the central atom. According to VSEPR, electron pairs will arrange themselves as far apart as possible to minimize repulsion, leading to specific molecular shapes and bond angles.
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Molecular Geometry vs. Electron Geometry

Molecular geometry refers to the three-dimensional arrangement of atoms in a molecule, while electron geometry considers the spatial arrangement of all electron pairs, including lone pairs. The presence of lone pairs can alter the observed molecular geometry, leading to differences between the idealized electron geometry and the actual molecular shape.
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Bond Angle Deviations

Bond angle deviations occur when the actual angles between bonds in a molecule differ from the idealized angles predicted by VSEPR theory. These deviations can arise due to factors such as the presence of lone pairs, differences in electronegativity between atoms, or steric hindrance, which can push bonded atoms closer together or further apart than expected.
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