Three orbitals are involved in bonding with three hydrogen atoms and the fourth one contains a lone pair. As lone pair-bond pair repulsion is stronger than bond pair-bond pair repulsion, the tetrahedral shape associated with s p^{3} bonding is changed to pyramidal. PH_3 combines with a ...
Lewis structures tell us the electron geometry of a molecule. The molecular geometry of a molecule is determined from its Lewis structure and VSEPR (valence shell electron pair repulsion) theory. The number of bonds and lone pair of electrons around the central atom of a molecule tell us its ...