Animals in Chile. The beautiful country of Chile is home to a variety of animals. Each species has adapted to each of the country's three main habitats consisting of the Andes Mountains, low coastal mountains, and the broad, fertile central valley.
Valence shell electron pair repulsion (VSEPR) theory is a model used, in chemistry, to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms.SEPR theory therefore views repulsion by the lone pair to be greater than the repulsion by a bonding pair. As such, when a molecule has 2 interactions with different degrees of repulsion, VSEPR theory predicts the structure where lone pairs occupy positions that allow them to experience less repulsion.
First, the VSEPR idea that lone pairs repel bonding pairs, distorting bond angles away from (usually to values smaller than) the ideal angles is valid. But second, when we add the concept of ligand close-packing, we can predict these angles with remarkable accuracy.