CHEM 031 Lecture Notes - Lecture 16: Diatomic Molecule, Lewis Structure, Lone Pair

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Valence shell electron pair repulsion (vsepr) is a model that allows for you to predict molecular shape on the basis that electrons repel each other. Aka 2 double bonds means two electron domains, 1 single bond + 1 double bond + 1 lone pair = 3 electron domains. Electrons will arrange themselves to be as far apart as possible so arrangements minimize repulsions. Electron domain geometry - arrangement of electron domains around a central atom. Molecular geometry - arrangement of bonded atoms (ignores lone pairs) Bond angle - angle between two adjacent atoms in a molecule. Some electron domains are better at repelling each other than others. Lone pairs repel more strongly than bonding pairs, multiple bonds repel more strongly than single bonds. More complex molecules are determined by treating them as though they have multiple central atoms. When an atom has one or more lone pairs, the molecular and electron domain geometry is no longer the same.

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