have a tetrahedral geometry with no central atom. An inorganic example is tetraphosphorus () which has four phosphorus atoms at the vertices of a tetrahedron and each bonded to the other three. An organic example is tetrahedrane () with four carbon atoms each bonded to one hydrogen and the other three carbons. In this case the theoretical C−C−C bond angle is just 60° (in practice the angle will be larger due to bent bonds), representing a large degree of strain. See also AXE method Orbital hybridisation References External links Examples of Tetrahedral molecules Animated Tetrahedral Visual Elmhurst College Interactive molecular examples for point groups 3D Chem – Chemistry, Structures, and 3D Molecules IUMSC – Indiana University Molecular Structure Center] Complex ion geometry: tetrahedral Molecular Modeling Molecular geometry