CBMS107 Lecture 4: Molecular Structure
3 Aug 2018
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6th march 2018: lecture four molecule structure. Lewis dot structures convey information about the connectivity of the atoms in a molecule. Molecule geometry conveys information of the molecules shape. Shape plays an important role in its reactivity. It is determined by its bond angles and bond lengths. We can predict the geometry by considering the number of bonding and nonbonding electron pairs: vsepr model: Repulsion(cid:495) predicts the spatial distribution around a central atom by minimizing repulsions (move away from each other) between valence electrons (domains) The electron domain geometry is often not the shape of the molecule. Molecules geometry is a result of the position of the atoms. Non-bonding electron pairs take up more room than a bond will cause a from the (cid:494)ideal(cid:495) bond angle. deviation (departing from standard) A molecule with two atoms = linear (no matter the electron domains) Molecules with 3 electron domains= trigonal planar. Molecules with 4 electron domains = tetrahedral.
