![]() VSEPR AB 3 E 3 1 AB 4 4 0 tetrahedral tetrahedral 10.1 Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry tetrahedral trigonal pyramidal.VSEPR AB 3 3 0 trigonal planar trigonal planar AB 2 E 2 1 10.1 Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry trigonal planar bent.AB 2 2 0 linear linear VSEPR 10.1 AB 4 4 0 tetrahedral tetrahedral AB 6 6 0 Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry AB 3 3 0 trigonal planar trigonal planar AB 5 5 0 trigonal bipyramidal trigonal bipyramidal octahedral octahedral.AB 2 2 0 linear linear VSEPR 10.1 AB 4 4 0 tetrahedral tetrahedral AB 5 5 0 Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry AB 3 3 0 trigonal planar trigonal planar trigonal bipyramidal trigonal bipyramidal.AB 2 2 0 linear linear VSEPR 10.1 AB 4 4 0 Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry AB 3 3 0 trigonal planar trigonal planar tetrahedral tetrahedral.AB 2 2 0 linear linear VSEPR AB 3 3 0 10.1 Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry trigonal planar trigonal planar. ![]() 10.1 Cl Cl Be 2 atoms bonded to central atom 0 lone pairs on central atom.AB 2 2 0 10.1 Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry linear linear B B Valence shell electron pair repulsion (VSEPR) model: Predict the geometry of the molecule from the electrostatic repulsions between the electron (bonding and nonbonding) pairs.Chemical Bonding II: Molecular Geometry and Hybridization of Atomic Orbitals.Stephen McNeil at UBC Okanagan.Īll educational works available on this page are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Canada License. This page is maintained and copyright by W. Basic ArrangementĪnother VSEPR page, including a number of practice problems, Note that multiple bonds are counted as one region of electron density.ģ)ĝetermine the basic arrangement of all electron density regions (bonds + lone pairs) about the central atom.Ĥ) Determine the molecular geometry based on resulting positions of atoms. ![]() The resulting molecular geometry depends only upon the positions of the atoms, and will differ from the electron pair arrangement if there are lone pairs on the central atom.Ģ)Ĝount the bonds and lone pairs about the central atom. A common notation is used to classify various molecules and the shapes they should adopt: AX nE m, where A = central atom, X = atoms connected to A by bonds, E = lone pairs on A. The shape of the molecule can differ from the basic arrangement of electron density regions, depending on how many "corners" of the arrangement are taken up by lone pairs. The basic arrangements of the electron pairs depends on the number of regions of electron density (bonds + lone pairs), as follows: Regions of the simple premise is a gross oversimplification of the underlying physical principles.offers only approximate, qualitative predictions for non-symmetric molecules. many structures not correctly predicted by simple Lewis model requires a valid Lewis structure, so limited to molecules for which Lewis structures are useful.especially useful for organic compounds.The predicted molecular shape will be such that the bonds and lone pairs are arranged so as to minimize repulsions and maximize the space among them. VSEPR theory treats each pair of electrons at an atom either bonds or lone pairs as a localized region of electron density, directed outward from the atomic centre. As such, VSEPR is an extremely powerful tool, because molecular shape offers insight into a wide range of important physical properties (polarity, solubility, volatility, chirality, etc). ![]() Valence Shell Electron Pair Repulsion (VSEPR) Theory is a simple, qualitative model that allows the prediction of an approximate molecular shape, given a valid Lewis structure of a molecule. ![]()
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