Provides instructions for making, inexpensively from envelopes, two polyhedra that illustrate chemical geometries. The individual steps involved, supported by detailed diagrams, are included. (JN)

A model of twin octahedrons having a common line which is useful for teaching stereochemistry (especially that of complex ions) can be made easily by using a sealed, empty envelope. The steps necessary to accomplish this task are presented. (JN)

A model of a cube which is necessary for teaching stereochemistry (especially of inorganic compounds) can be made easily, by using a sealed, empty envelope. The steps necessary to accomplish this task are presented. (JN)

A model of a trigonal prism which is useful for teaching stereochemistry (especially of the neodymium enneahydrate ion), can be made easily by using a sealed, empty envelope. The steps necessary to accomplish this task are presented. (JN)

A model of a square antiprism which is necessary for teaching stereochemistry (for example, of the octafluorotantalate ion) can be made easily by using a sealed, empty envelope. The steps necessary to accomplish this task are presented. (JN)

A model of a dodecahedron which is necessary for teaching stereochemistry (for example, that of dodecahedrane) can be made easily by using a sealed, empty envelope. The steps necessary for accomplishing this task are presented. (JN)

Illustrates and outlines steps for constructing models of twin octahedrons and a rhombohedron. (SK)

Illustrates the 18 steps to the development of a model of a coordination polyhedron that represents the cubic closest-packed structure. Uses a sealed, empty envelope in developing the model in teaching about stereochemistry. (TW)

Illustrates the 29 steps involved in the development of a model of a coordination polyhedron that represents the hexagonal closest packed structure. Points out it is useful in teaching stereochemistry. (TW)

The construction of a model that is useful for teaching stereochemistry from a sealed empty envelope is described. Detailed steps with accompanying diagrams are given. (CW)

The construction of a model that is useful for teaching stereochemistry from two sealed empty envelopes is described. Detailed steps with accompanying diagrams are given. (CW)

Describes how to make the following paper molecular models: trigonal prism; tetragonal pyramid; tetrahedral; and trigonal pyramid. Methodology is given for general paper model manipulation to make various shapes including a chain of tetrahedra and an icosahedron. (MVL)