Electron+Domain+Geometries


 * Electron Domain Geometries**

Electron Domain Geometries determine the arrangement of the electrons about the central atom of a molecule or ion. To find the electron domain geometry the Lewis structure and number of electron domains present in the molecule or ion. The electron domain geometry is used to predict and determine the molecular geometry of a molecule.

Electron domain geometries are an element of the VSEPR (valence-shell electron-pair repulsions) model, so the arrangements follow the theory that the most effective arrangement minimizes the repulsions among the electron domains. The shape of a molecule and the angles of the shape are decided by the molecule's electron domains, which are each negatively charged. The domains repel one another due to their charge so they try to stay as far away from one another as possible.
 * Shapes**

The shape is also dependent on the number of electron domains around the central atom. An electron domain can be a single bond, a multiple bond, or a nonbonding pair. There are five electron domain geometries based on the number of electron domains, these shapes have been displayed in the following chart:

Sources: //Chemistry:The Central Science (Ninth Edition)// http://www.ktf-split.hr/glossary/en_s.php?page=2?&def=molecular%20geometry http://commons.wikimedia.org/wiki/Image:Octahedral-3D-balls.png