An example of bent molecular geometry that results from tetrahedral electron pair geometry is H 2 O. Hi! ... Take the water molecule. The water molecule is so common that it is wise to just memorize that water is a BENT molecule. Bent. Valence shell electron pair repulsion theory, or VSEPR theory (/ ˈ v ɛ s p ər, v ə ˈ s ɛ p ər / VESP-ər,: 410 və-SEP-ər), is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms. Water: Chime in new window. The oxygen has 6 valence electrons and thus needs 2 more electrons from 2 hydrogen atoms to complete its octet. Now, for H20, Let's calculate it's hybridization first, Central atom-Oxygen , no. On the Lewis diagram, identify the central atom. 1 decade ago. Image courtesy:wikipedia.com This theory helps to determine the shape of polyatomic covalent molecules. There is no direct relationship between the formula of a compound and the shape of its molecules. Favorite Answer. The shapes of these molecules can be predicted from their Lewis structures, however, with a model developed about 30 years ago, known as the valence-shell electron-pair repulsion (VSEPR) theory.. According to VSEPR theory , the molecular shape of H2O is classified as...? Recognize that molecule geometry is due to repulsions between electron groups. For the above molecule VSEPR notation will be AX 3. It is also named the Gillespie-Nyholm theory after its two main developers, Ronald Gillespie and Ronald Nyholm. Download a copy of VSEPR shapes table here Bond angle in H 2 CO Bond angle in COCl 2 molecule is 120º.The representation is shown below. AX 3 has trigonal planarl shape. ... Lv 4. Molecular Shape and VSEPR . Recognize the difference between electron and molecular geometry. Of valence shell electrons- 6. Step 3: Use VSEPR table to find the shape. I1- Using VSEPR to Predict Shapes of Molecules The VSEPR predicted shapes of molecules can be found in a systematic way by using the number of electron pairs to determine the shape of the molecules. 9 It has 3 atoms and 2 lone pairs. Bent Remember VSEPR is not a real theory, just an algorithm and hybridisation is not consistent with experiments. This model takes into account the number of bond sites and number of lone electron pairs in a molecule in order to produce a prediction of a molecule's shape based on its parts. Use Molecular Orbital Theory for precision. Thanks for the A2A. Chemists use the VSEPR (Valence Shell Electron Pair Repulsion) model for molecular geometry, or, the determination of a molecule's physical shape. So the shape of H 2 COmolecule is octahedral. Compare bond angle predictions from the VSEPR-based model to real molecules. 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