According to VSEPR model, the progressive decrease in the bond angles in the series of molecules CH4, NH3 and H2O is best accounted for by the increasing number of unshared pairs of electrons.
What is the VSEPR theory?
- Lewis structures only tell the number and types of bonds between atoms, as they are limited to two dimensions. The VSEPR model predicts the 3-D shape of molecules and ions but is ineffective in providing any specific information regarding the bond length or the bond itself.
- VSEPR models are based on the concept that electrons around a central atom will configure themselves to minimize repulsion, and that dictates the geometry of the molecule.
- It can predict the shape of nearly all compounds that have a central atom, as long as the central atom is not a metal. Each shape has a name and an idealized bond angle associated with it.
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