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Molecular shapes. Chapter 9. VSEPR model. Bonding pair = electrons in a bond = electron domain (~orbital/orbitals) Non-bonding pair = electron domain (~orbital). Molecular geometry. Draw Lewis dot diagram Determine number of electron domains domain geometry
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Molecular shapes Chapter 9
VSEPR model • Bonding pair = electrons in a bond = electron domain (~orbital/orbitals) • Non-bonding pair = electron domain (~orbital)
Molecular geometry • Draw Lewis dot diagram • Determine number of electron domains domain geometry • Non-bonding electron pairs must have maximum separation • Determine molecular geometry
Bond angles • Lone pairs and double bonds take up more space • push other bonds closer together • Bond angles become smaller • e.x. H2O bond angle is about 104° • (instead of 109.5°)