Valence Shell Electron Pair Repulsion Theory

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Presentation transcript:

Valence Shell Electron Pair Repulsion Theory Planar triangular Valence Shell Electron Pair Repulsion Theory Tetrahedral Trigonal pyramidal Bent

In VSEPR, electrons in the valence shell repel each other In VSEPR, electrons in the valence shell repel each other. This means that bonded atoms are as far apart as possible. The positions of the atoms in a molecule determine molecular shape. Molecular shape is important because it can determine the biological activity of molecules.

Hydrocodone (Vicodin) Codeine In fact, changing one atom on a molecule can cause a huge change in the molecule’s properties. While both codeine and hydrocodone are pain killers, codeine can cause hallucinations in some patients. Notice the small difference in molecular structure between the two molecules. Hydrocodone (Vicodin) Codeine

VSEPR overview Names of Shapes: tetrahedral trigonal pyramidal Bent Each shape has a name (you will have to know these) Names of Shapes: tetrahedral trigonal pyramidal Bent Linear trigonal planar

Practice.

.. .. water, H2O 109.5° (109.5°) 109.5° (107°) 109.5° (104.5°)

.. ..

Bent or V 2 unshared pairs of e’s at top of O repel bonds and force them to bend