Molecular Geometry and VSEPR Theory Molecular Shapes • The shape of a molecule plays a large part in determining its properties and reactivities. • We can predict shapes by examining the Lewis structure for orientation of electron pairs. • Electron pairs arrange themselves to minimize electrical repulsion. VSEPR Theory ▪ In order to predict molecular shape, we assume the valence electrons repel each other. Therefore, the molecule adopts whichever 3D geometry minimized this repulsion. ▪ Electron pairs arrange themselves as far as possible from each other. ▪ We call this process Valence Shell Electron Pair Repulsion (VSEPR) theory. Why is VSEPR Theory Important? • Gives a specific shape due to the number of bonded and non-bonded electron pairs in a molecule • Tells us the actual 3-D structure of a molecule • Again in bonding, electron pairs want to be as far away from each other as possible.

Molecular Geometry and VSEPR Theory

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