Explore how metallic bonding explains the structure and properties of metals. Begin with neutral sodium atoms, then press Delocalise to watch their outer electrons become shared throughout the metal, leaving positive ion cores. Six interactive screens cover metallic structure, electrical conductivity, thermal conduction, melting, malleability and alloys, with an A-level comparison of sodium, magnesium and aluminium. Pause, step and replay controls support discussion, while the layout keeps each demonstration and its explanation visible together. simopsis