VSEPR Theory stands for “valence-shell, electron-pair repulsion” When bonding occurs, the electrons pairs will orient themselves so they are spread out as far as possible – Refers to valence electrons of central atom in the molecule
VSEPR Molecular Geometry Lewis Dot Structures can be used to predict molecular shape Actual shape of the molecule is determined by the atoms only – Unpaired electrons on the central atom do take up space, however, and do affect the shape – Total number of electron concentrations= Shared pairs + lone pairs Double and triple bonds are treated the same as single bonds, and have no affect on the molecular shape
Linear General formula: AB 2 2 atoms bonded to central atom Ex: CO 2 180° O C O
Trigonal Planar General formula: AB 3 3 atoms bonded to central atom Ex: BF 3 120° F B F
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