Molecular shapes - electron repulsion theory molyorbital 8 model collection set. This molecular model set contains sufficient parts to make eight atomic models. The different shapes are examples of the orientations of the bonds and cover coordination numbers 1 to 6 of atomic structures. Lone electron pairs are represented by brown spheres or brown pear shaped parts. The two extra pear shaped parts are included in the set to enable protonated models to be made, e.g. acid/base theory, the formation of H3O as a result of the migration of H+ from hydrogen chloride. The molecular model set includes: 13 hydrogen (white), 7 chlorine (green), 9 fluorine (light green), 1 beryllium (grey), 1 boron (beige), 1 chlorine (light green), 1 oxygen (red), 1 nitrogen (blue), 1 carbon (black), 1 phosphorus (purple), 1 sulphur (yellow), 26 sigma bonds (grey), 6 lone pair orbital (beige), 6 protonated lone pair orbital (beige), 6 short link (white).