Why Is Vsepr Theory Not Needed

VSEPR theory is used to predict the arrangement of electron pairs around central atoms in molecules, especially simple and symmetric molecules. … The geometry of the central atoms and their non-bonding electron pairs in turn determine the geometry of the larger whole molecule.

What is wrong with VSEPR theory?

Some significant limitations of the VSEPR theory include: This theory fails to explain isoelectronic species (i.e. elements having the same number of electrons). The species may vary in shapes despite having the same number of electrons. The VSEPR theory does not shed any light on the compounds of transition metals.

Under what circumstances does VSEPR work?

VSEPR works on the assumption that the shape adopted is that which minimises repulsions between the electron pairs in the molecule.