Trigonal planar molecular

This molecule (type AB3) has a trigonal planar electronic geometry and trigonal planar molecular geometry. The B-Cl bonds are polar, but since the molecule is symmetrical, the bond dipoles cancel to give a nonpolar molecule (Section 8-6). 

In this hybridized state the carbon will make two single bonds and one double bond. This will allow the carbon atom to bond to three different atoms. The orientation of these atoms around the carbon atom will be trigonal planar molecular geometry. The angle of these atoms to one another is 120 degrees. This is demonstrated in the diagram of ethene shown in Figure 3.11. 

The sp2 hybridization of the two carbon atoms in ethane and the six valence electrons preferred by boron, gives rise to a trigonal planar molecular geometry. Cyclopropane has all single bonds in its molecule and will have sp3 hybridized carbon atoms. 

Look again at Table 9-3 on the previous page. Notice that the number of atomic orbitals mixed to form the hybrid orbital equals the total number of pairs of electrons. In addition, the number of hybrid orbitals formed equals the number of atomic orbitals mixed. For example, AICI3 has a total of three pairs of electrons and VSEPR predicts a trigonal planar molecular shape. To have this shape, one s and two p orbitals on the central atom A1 must mix to form three identical sp hybrid orbitals. 

T2.6 The planar from of NHj molecule would have a trigonal planar molecular geometiy with the lone pair residing in nitrogen s p orbital that is perpendicular to the plane of the molecule. This structure belongs to a Djh point group (for discussion of molecular symmetry and point groups refer to Chapter 6). Now we can consult Resource Section... 

Electron-domain geometry trigonal planar, molecular geometry trigonal planar... 

The three sp hybrid orbitals lie in the same plane, 120° apart from one another. They are used to make three equivalent bonds with the three fluorine atoms, leading to the trigonal-planar molecular geometry of BF3. Notice that an unfilled 2p atomic orbital remains unhybridized. This unhybridized orbital will be important when we discuss... 

A FIGURE 9.22 Trigonal-planar molecular geometry of ethylene. The... 

Consider the following AB3 molecules and ions PCI3, SO3, AICI3, S03 , and CH3. How many of these molecules and ions do you predict to have a trigonal-planar molecular geometry ... 

A Figure 9.22 Trigonal-planar molecular geometry of ethylene. The double bond is made up of one C—Co- bond and one C—Ct7 bond. 

When there are three electron groups around the central atom, it is sp hybridized. AB molecules and ions with no lone pairs on the central atom have trigonal planar electronic geometry, trigonal planar molecular geometry and sp hybridization on the central atom. 

Electron geometry = Trigonal planar Molecular geometry = Bent... 

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