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VSEPR Theory

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

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VSEPR Theory

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  1. VSEPR Theory Valence Shell Electron Pair Repulsion

  2. 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

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

  4. Linear • 2 atoms attached to center atom • 0 unshared pairs (lone pairs) • Bond angle = 180o • Type: AX2 • Ex. : BeF2

  5. Trigonal Planar • 3 atoms attached to center atom • 0 lone pairs • Bond angle = 120o • Type: AX3 • Ex. : AlF3

  6. Tetrahedral • 4 atoms attached to center atom • 0 lone pairs • Bond angle = 109.5o • Type: AX4 • Ex. : CH4

  7. Trigonal Bipyramidal • 5 atoms attached to center atom • 0 lone pairs • Bond angle = • equatorial -> 120o • axial -> 90o • Type: AX5 • Ex. : PF5

  8. Octahedral • 6 atoms attached to center atom • 0 lone pairs • Bond angle = 90o • Type: AX6 • Ex. : SF6

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

  10. Bent • 2 atoms attached to center atom • 2 lone pairs • Bond angle = 104.5o • Type: AX2E2 • Ex. : H2O

  11. Trigonal Pyramidal • 3 atoms attached to center atom • 1 lone pair • Bond angle = 107o • Type: AX3E • Ex. : NH3

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