PRACTICE PROBLEMS : Use the electron dot structure (Lewis structure) and the electron geometry table to determine the steric number and electron geometry. What is the steric number and electron geometry of PH5? The molecular geometry, or three-dimensional shape of a molecule or polyatomic ion, can be determined using valence-shell electron-pair repulsion (abbreviated VSEPR and pronounced VES-per) theory, in which the basic principle is valence electrons around a central atom stay as far apart as possible to. What is the steric number and electron geometry of BrF3? What is the steric number and electron geometry of SH2? What is the steric number and electron geometry of SO2? The hybridization of boron in BH 3 is sp 2. CH4 molecular geometry is tetrahedral and its electron geometry is also tetrahedral. The electron geometry of BH 3 is also Trigonal planar as its central atom has 3 regions of electron density. What is the electron-pair geometry around an atom in a molecule or ion which is surrounded by two lone pairs of electrons and three single bonds. Refer to the electron geometry table below.Įxamples: Use the electron geometry table to determine the steric number and electron geometry of each molecule. Lewis dot structure of BH 3 contains 1 lone pair on the central atom and 0 lone pairs on outer atoms. In molecular shape (molecular geometry) you treat the electron’s lone pairs and the bonds as two different and separate things. What is the molecular geometry around an atom in a molecule or ion which is surrounded by zero lone pairs of electrons and four single bonds. 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. You also treat double and triple bonds as one group instead of 3 just like you did in molecular shape. Thus, the electron-pair geometry is tetrahedral and the molecular structure is bent with an angle slightly less than 109.5°. However, with electron geometry (steric number) lone pairs and bonds are treated the same. The Lewis structure of H 2 O indicates that there are four regions of high electron density around the oxygen atom: two lone pairs and two chemical bonds: Figure 7.6.9 7.6. 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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