This handout will discuss how to use the VSEPR model to predict electron and. ![]() This model predicts the shape of a molecule by taking into account the repulsion between electron pairs. In molecules with more than three atoms, there are many more possible geometries. The valence-shell electron-pair repulsion (VSEPR) model is often used in chemistry to predict the three dimensional arrangement, or the geometry, of molecules. However, with a triatomic molecule (three atoms), there are two possible geometries: the atoms may lie on a line, producing a linear molecule, or not, producing a bent molecule. An example of the complexities which arise with polyatomic molecules is molecular geometry: how are the atoms in the molecule arranged with respect to one another? In a diatomic molecule, only a single molecular geometry is possible since the two atoms must lie on a line. In this case an extra step is needed to to translate from electron pair geometry to the final molecular geometry, since only the positions of bonded atoms are. Group 2: Molecules with one or more lone electron pairs. So when asked to describe the shape of a molecule we must respond with a molecular. The molecular geometry is the shape of the molecule. The electron-pair geometry provides a guide to the bond angles of between a terminal-central-terminal atom in a compound. In this case the molecular geometry is identical to the electron pair geometry. Molecular geometry is the name of the geometry used to describe the shape of a molecule. The hybridization of boron in BF 3 is sp 2. In the BF 3 Lewis dot structure, a total of 9 lone pairs and 3 bond pairs are present. The electron geometry of CO2 is linear as well. Thus the molecular geometry of the CO2 molecule will be linear. So from the above chart, it’s clear that CO2 is an AX2 type molecule, where X bonded atom. ![]() A polyatomic molecule contains more than two atoms. Group 1: Molecules with NO lone electron pairs. The electron geometry of BF 3 is also Trigonal planar, as its central atom, is surrounded by the 3 regions of electron density. The VSEPR chart is attached below, which will give us an idea about this.
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