Methane has 4 regions of electron density around the central carbon atom (4 bonds, no lone pairs). The resulting shape is a regular tetrahedron with H-C-H angles of 109.5°. Also, the angular geometry of the H-C=C bond in ethylene is 121.3 degrees. The VSEPR theory states that electron pairs located around a certain atom repel each other. Electron geometry is the shape of a molecule predicted by considering both bond electron pairs and lone electron pairs. An example of tetrahedral electron pair geometry and molecular geometry is CH4[math]C[/math][math]H[/math][math]4[/math]. The electron group geometry for a molecule with four electron pairs is tetrahedral, as was seen with \(\ce{CH_4}\). Methane on Wikipedia. This corresponds to four shape-determining electron pairs. Ethylene, or C2H4 has two trigonal planar type molecular geometries and its center is tetrahedral. Valence Shell Electron Pair Repulsion. CH 4). If there is one lone pair of electrons and three bond pairs the For example; four electron pairs are distributed in a tetrahedral shape. We can draw the Lewis structure on a sheet of paper. Would the same geometry pertain to ammonium ion, NH_4^+? … VSEPR CH 4 Methane. Lets consider the Lewis structure for CCl 4. The calculation for methane shows that the carbon atom is associated with 8 electrons in the σ framework. Hybridization: sp 3 Then draw the 3D molecular structure using VSEPR rules: Decision: The molecular geometry of methane - CH 4 - is tetrahedral with symmetric charge distribution on the central atom. What is the electron geometry and the molecular geometry of PCl3, CHCl3, SiH4, TeCl4, NH4+, NH2-, CO3 2-, and ICl2-? In the ammonia molecule, one of the electron pairs is a lone pair rather than a bonding pair. I would really appreciate it. The coordination geometry of carbon is consequently tetrahedral. Although the lone pair is not visible, it will affects the location and bond angles among other atoms in the molecule. The ideal tetrahedral bond angle is 109.5 0 Take the water molecule. For the molecule CH4, the electron geometry and molecular geometries are: a. tetrahedral, trigonal pyramidal b. tetrahedral, tetrahedral c. tetrahedral, bent d. none. Source(s): electron geometry molecular geometry pcl3 chcl3 sih4 tecl4 nh4: Click the structures to load the molecules. For the molecule CH 4, the electron geometry and molecular geometries are: a. tetrahedral, trigonal pyramidal b. If these are all bond pairs the molecular geometry is tetrahedral (e.g. There are 4 regions of electron density, 4 orbitals, around the central carbon atom; therefore..... And therefore, the electronic geometry will be tetrahedral. What is Electron Geometry. Electron geometry: tetrahedral. For more complicated molecules the geometry at each atom may have to be determined in order to get an dea of the overall shape. There are four bonded groups, therefore there are no lone pairs. Key Terms: Electron Geometry, Lone Electron Pair, Molecular Geometry, VSEPR Theory. CONTROLS . Question. For four electron density areas, the ideal geometry is tetrahedral and molecular shape is same as electronic geometry. For trigonal pyramidal geometry the bond angle is slightly less than 109.5 degrees, around 107 degrees. Therefore this molecule is non-polar. Since all of these electron pairs represent C-H bonds, the molecular geometry will also be tetrahedral with /_H-C-H=109.5^@. For bent molecular geometry when the electron-pair geometry is tetrahedral the bond angle is around 105 degrees.