Valence Shell Electron Pair Repulsion

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Presentation transcript:

Valence Shell Electron Pair Repulsion VSEPR Theory Valence Shell Electron Pair Repulsion

VSEPR Theory Predicts the molecular shape of a bonded molecule Electrons around the central atom arrange themselves as far apart from each other as possible Unshared pairs of electrons (lone pairs) on the central atom repel the most So only look at what is connected to the central atom

These are for molecules with only paired electrons around the central atom.

Linear 2 atoms attached to center atom 0 unshared pairs (lone pairs) Bond angle = 180o Type: AB2 Ex. : BeF2

Trigonal Planar 3 atoms attached to center atom 0 lone pairs Bond angle = 120o Type: AB3 Ex. : AlF3

Tetrahedral 4 atoms attached to center atom 0 lone pairs Bond angle = 109.5o Type: AB4 Ex. : CH4

These are for molecules with both paired and unshared (lone) pairs of electrons around the central atom.

Bent 2 atoms attached to center atom 2 lone pairs Bond angle = 104.5o Type: AB2E2 Ex. : H2O

Trigonal Pyramidal 3 atoms attached to center atom 1 lone pair Bond angle = 107o Type: AB3E Ex. : NH3