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Chapter 6: Problem 15

Why is the theory that governs the shape of molecules called VSEPR and not just EPR?

Short Answer

Expert verified
The VSEPR (Valence Shell Electron Pair Repulsion) theory is preferred over the EPR (Electron Pair Repulsion) theory in governing the shape of molecules because it specifically focuses on the valence shell electron pairs, which are crucial in determining the geometry of molecules. By considering the repulsion between these electron pairs, VSEPR theory provides a more accurate and detailed explanation of molecular shapes than the general EPR theory, which lacks the focus on the essential role of valence shell electron pairs in determining the molecule's geometry.

Step by step solution

01

Understand VSEPR Theory

VSEPR (Valence Shell Electron Pair Repulsion) theory is a model in chemistry that is used to predict the shapes of individual molecules based on the number of electron pairs surrounding their central atoms. The basic principle of this theory is that electron pairs in the valence shell of an atom repel each other and tend to orient themselves as far apart as possible from one another to minimize the overall repulsion energy.
02

Understand EPR Theory

EPR (Electron Pair Repulsion) theory is a general concept that suggests electron pairs repel each other and influence the arrangement of atoms in a molecule. However, this theory doesn't specifically take into account the valence shell electrons which are crucial in determining the molecular shape. It also lacks the focus on how the positioning of electron pairs around the central atom affects the geometry of the molecule.
03

Difference between VSEPR and EPR Theory

The critical difference between the two theories is the emphasis on valence shell electrons in the VSEPR theory. It focuses on the arrangements and orientations of electron pairs in the valence shell to predict the molecular shapes. EPR theory, on the other hand, does not emphasize the essential role of valence shell electron pairs in determining the molecule's geometry. Thus, EPR theory is more general and less specific to molecular shapes.
04

Why VSEPR, not just EPR?

VSEPR theory is preferred over EPR theory in governing the shape of molecules because it specifically focuses on the valence shell electron pairs, which are of primary importance in determining the geometry of molecules. By considering the repulsion between these electron pairs, VSEPR theory provides a more accurate and detailed explanation of molecular shapes than the general EPR theory.

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