In these molecules, each central atom has three electron clouds emanating from it. Structures with Three Regions of High Electron Density around the Central Atom Figure 7.6 shows the linear nature of these molecules.įIGURE 7.6 Linear molecules: (a) carbon dioxide, CO 2 (b) hydrogen cyanide, HCN and (c) acetylene, C 2H 2.ī. The VSEPR theory says, then, that the geometry around an atom that has only two bonds and no unshared electrons is a straight line. For these two clouds to be as far away from each other as possible, they must be on opposite sides of the central atom, forming a Only two electron clouds emerge from that central atom. Notice that, in the Lewis structure of these molecules, the central atom(s) bonds with only two other atoms and has no unshared electrons.
Some three-atom molecules also have straight-line geometry. If a molecule contains only two atoms, those two atoms are in a straight line and thus form a linear molecule. The VSEPR model states that the various regions containingĮlectrons or electron clouds around an atom spread out so that each region is We have already learned that like charges Each set of electrons, whether unshared or in a bond, createsĪ negatively charged region of space. May be involved in the formation of single, double, or triple bonds, or they Know that an atom has an outer shell of valence electrons. The VSEPR model can be explained in the following way. (VSEPR) model to predict the geometry of these and other covalently bonded In this section, we use the valence-shell electron-pair repulsion Molecules and ions containing various combinations of single, double, and tripleīonds. Unit of the covalent bond, and Lewis structures were drawn for several small In the previous section a shared pair of electrons was presented as the fundamental
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