An interactive GCSE Chemistry visualisation for exploring the properties and reactions of the Group 7 halogens. Students compare chlorine, bromine and iodine, investigate trends in relative molecular mass, melting point and boiling point, explore why reactivity decreases down the group, and model the formation of ionic and covalent compounds. An interactive displacement-reaction lab allows students to predict, observe and explain reactions between halogens and aqueous halide salts. Projector and Student views, staged animations, predictions and diagnostic questions support both whole-class teaching and independent learning. simopsis