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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > December  >
Information • Textbooks • Media • Resources
A Comment on Molecular Geometry
Frank J. Gomba
Department of Chemistry, U. S. Naval Academy, Annapolis, MD 21402-5026
Cover
December 1999
Vol. 76 No. 12
p. 1732
Abstract
A method of determining the correct molecular geometry of simple molecules and ions with one central atom is proposed. While the usual method of determining the molecular geometry involves first drawing the Lewis structure, this method can be used without doing so. In fact, the Lewis structure need not be drawn at all. The Lewis structure may be drawn as the final step, with the geometry of the simple molecule or ion already established. In the case of diatomic molecules, any atom may be used as the central atom. When hydrogen is present in a multiatom molecule or ion, this method "naturally" eliminates choosing hydrogen; but, any other atom may be used as the central atom to determine the correct geometry. The Lewis structure can then be used to determine the formal charges on the atoms. In this way there is a check on the selection of the central atom, should the correct Lewis structure be desired. Thus, it assumes that one is familiar with both Lewis structures and the valence shell electron pair repulsion (VSEPR) approach to bonding. The approach suggested in this paper will give rapid and accurate molecular geometries, and it is fun !!!
More Information
*  Citation
 Gomba, Frank J. J. Chem. Educ. 1999 76 1732.
*  Keywords
 Introductory / High School Chemistry; Teaching / Learning Aids; Bonding Theory; Molecular Properties / Structure
*  History
 Created:
Last Updated:		 November 10, 1999
June 23, 2005
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