The halogens, group 7, are an important group of elements both chemically and socially. They are unusual in that they are coloured and diatomic. They also have an order of reactivity that is the opposite of the metals in groups 1 and 2. In fact they are all very reactive, fluorine being the most reactive non-metal. This programme is designed to develop students understanding of the halogens and the halides. It investigates both the source and uses of the materials as well as the chemistry involved. Working through the activities will also develop thinking and research skills.