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infoWhy this? Halogen chemistry connects atomic structure and intermolecular forces with trends in physical properties and oxidising ability. Displacement reactions, halide tests, and uses of chlorine show how these principles support chemical identification and applications such as water treatment.

scheduleWhy now? The preceding work on periodicity and redox allows us to explain trends down a group and interpret displacement reactions as electron transfer. This detailed study of non-metals also provides a useful comparison with the Group 2 metals that follow.