![]() PRACTICE PROBLEMS : Use the electron dot structure (Lewis structure) and the electron geometry table to determine the steric number and electron geometry. Question: Consider the following molecule. What is the steric number and electron geometry of PH5? ![]() What is the steric number and electron geometry of BrF3? According to the VSEPR chart, if any molecule contains zero lone pair and Sp² hybridization then the molecular and electron geometry of that molecule is trigonal planar. What is the steric number and electron geometry of SH2? Use VSEPR theory or AXN method to determine C2H4 molecular geometry. What is the steric number and electron geometry of SO2? Refer to the electron geometry table below.Įxamples: Use the electron geometry table to determine the steric number and electron geometry of each molecule. 1 3 trigonal bent Examples: SO2, O3 0 4 tetrahedral tetrahedral Bond Angle 180° 120° 120° 109. This means you count up the lone pairs and number of atoms attached to the central atom into one number (the steric number) and from there determine electron geometry. The electron-pair geometries shown in Figure 7.16 describe all regions where electrons are located, bonds as well as lone pairs. It is important to note that electron-pair geometry around a central atom is not the same thing as its molecular structure. It would seem more correct that what they call 'VSEPR geometry' includes the lone pairs, while their 'observed geometry' is only the arrangement of atoms, ignoring the lone pairs. Electron-pair Geometry versus Molecular Structure. You also treat double and triple bonds as one group instead of 3 just like you did in molecular shape. Ive never seen this distinction made between 'VSEPR geometry' and 'observed geometry', and it does not make much sense to me. However, the lone pairs present on the O-atom lead to electronic repulsion and thus molecular distortion which reduces the C-O-H bond angle from an ideal value of 109° to approx. However, with electron geometry (steric number) lone pairs and bonds are treated the same. It is due to the tetrahedral shape of CH 3 CH 2 OH that each H-C-H bond angle is equal to 109.28° in the Ethyl alcohol molecule. In molecular shape (molecular geometry) you treat the electron’s lone pairs and the bonds as two different and separate things. What is the difference between electron geometry (electron domains / electron clouds / steric number) and molecular shape (molecular geometry)?īoth are very similar, but the difference is in how we treat that electron’s lone pairs versus the bonds.
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