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vijay123
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does anyone have good tutorials on the vsepr theory...anything about the lewis dot structure...more advanced.
The VSEPR (Valence Shell Electron Pair Repulsion) theory is a model used to predict the shapes of molecules based on the repulsion of electron pairs in the valence shell of atoms.
The main principles of the VSEPR theory are: 1) the central atom and surrounding atoms will arrange themselves to minimize repulsion between electron pairs, 2) lone pairs of electrons will repel more strongly than bonded pairs, and 3) multiple bonds will repel more strongly than single bonds.
To determine the molecular geometry, you first need to draw the Lewis structure of the molecule. Then, count the number of electron pairs (both bonding and non-bonding) around the central atom. Based on this number, you can use the VSEPR chart to determine the molecular geometry.
Molecular geometry refers to the actual shape of the molecule, while electron geometry refers to the arrangement of electron pairs around the central atom. In some cases, these geometries may be the same, but in others, they may differ due to the presence of lone pairs.
The VSEPR theory does not account for the presence of d or f orbitals in larger atoms, as it was developed for simpler molecules. It also does not take into consideration the effect of lone pair-bond pair repulsion, which can sometimes result in distorted geometries. Additionally, the theory does not explain the relative bond lengths and strengths of molecules.