A
molecular model, in this article, is a physical model that represents
molecules and their processes. The creation of mathematical models of molecular properties and behaviour is
molecular modelling, and their graphical depiction is
molecular graphics, but these topics are closely linked and each uses techniques from the others. In this article, "molecular model" will primarily refer to systems containing more than one atom and where nuclear structure is neglected. The electronic structure is often also omitted or represented in a highly simplified way.