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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > July  >
In the Classroom
Teaching Space Group Symmetry through Problems
George L. Hardgrove, Jr.
Department of Chemistry, St.Olaf College, 1520 Saint Olaf Avenue, Northfield, MN 55057-1098
Cover
July 1997
Vol. 74 No. 7
p. 797
Abstract
Symmetry in the solid state is often neglected in chemical education. Worked examples of high symmetry structures including NaCl, CaF2, K2SiF6, hexamethylenetetramine, and cubane help the student visualize space group symmetry. The student first determines the number of molecules or formula units per cell from the density and unit-cell dimensions. The numbers of atoms of each element are then compared with the numbers of equivalent general or special positions for the space group. Atoms are then placed in positions in the unit cell consistent with the geometry expected for the molecule or ion. References are then given to 11 other compounds suitable for this type of analysis.
More Information
*  Citation
 Hardgrove, Jr., George L. J. Chem. Educ. 1997 74 797.
*  Keywords
 Crystallography, Group Theory
*  History
 Created:
Last Updated:		 July 28, 1999
June 23, 2005
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