Explore the formation, structure and properties of ionic compounds through animated dot-and-cross diagrams. Follow single and multiple electron transfers, inspect the resulting ions and build chemical formulae by balancing charges. Compare a flat lattice layer with a rotatable 3D model, then investigate melting, electrical conductivity, brittleness and dissolving. GCSE and A-level modes provide suitable examples and extensions, with step-by-step playback, optional full-shell diagrams and activities that connect particle models to clear written explanations. simopsis