The Valence Shell Electron Pair Repulsion model

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The Valence Shell Electron Pair Repulsion model

목차

What is VSEPR?
VSEPR Rules
VSEPR Examples/Practice Problems
Test My Knowledge
VSEPR Rules 3
1. Linear
2. Trigonal Planar
3. Tetrahedral
4. Trigonal Bipyramidal
5. Octahedral
Practice Problem

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What is VSEPR?
1.What does VSEPR stand for?
- The Valence Shell Electron Pair Repulsion model
2.What is the major use for this chemical concept?
- Can be used to predict structures of molecules or ions that contain only non-metals by minimizing the electrostatic repulsion between the regions of high electron density.
- Can also be used to predict structures of molecules or ions that contain multiple bonds or unpaired electrons.
VSEPR Rules

1. In order to determine the proper structure of a molecule or ion what is the first thing one must do?
- Draw the Lewis structure for the molecule or ion.

2. From the Lewis diagrams, what information about the molecule can we get?
Total number of regions of high electron density - Bonding and unshared electron pairs
- Double and triple bonds count as ONE REGION OF HIGH ELECTRON DENSITY.
- An unpaired electron counts as ONE REGION OF HIGH ELECTRON DENSITY.
- For molecules or ions that have resonance structures, you may use any one of the resonance structures.

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