Molecular Model Set – Sodium Chloride (Open Type – 27 Atoms) This molecular model set represents the crystal structure of Sodium Chloride (NaCl) in an open lattice form with 27 atoms. It is designed to clearly demonstrate the ionic arrangement between sodium (Na⁺) and chloride (Cl⁻) ions in a cubic structure. The open model allows students to easily visualize bonding patterns, coordination number, and the repeating unit of the crystal lattice. The set is made using durable, color-coded balls and connecting rods to distinguish between different ions. It is widely used in schools and colleges for teaching concepts of ionic bonding and solid-state chemistry. The model helps enhance practical understanding of crystal geometry and lattice formation in an interactive way.