1. A computer apparatus for exhibiting the properties and structure of matter comprising: a visual display unit; a data entry device; and a data processing system connected to said visual display unit and said data entry device, said data processing system having atomic structure program means for constructing mathematical atomic models, and a text/graphic interactive user interface having program selection means for permitting a user to interact with and perform operations on said atomic structure program means via said data entry device and said visual display unit, an atomic data base containing atomic information for use by said atomic structure program means for constructing said mathematical atomic models, an atomic data display means for displaying on said visual display unit atomic select buttons and said atomic information in response to selections made by said user via said atomic select buttons and said data entry device, and a graphic display means for displaying graphical representations of said mathematical atomic models on said visual display unit, and wherein said atomic data display means includes a periodic table means for displaying a plurality of said atomic select buttons to form element buttons labeled with said atomic information to form a periodic table of chemical elements on said visual display unit, and an element means for displaying on said visual display unit, in response to selection of one of said element buttons, a plurality of said atomic select buttons to form isotope buttons labeled with isotope information from said atomic information, said isotope information corresponding to the isotopes of said one of said chemical elements.