At the surfaces of materials, the Chemistry can be very different from that in molecules and in the bulk of materials. Having fewer neighbouring atoms and molecules than in the bulk, the surface atoms can adopt quite different bonding environments. The electronic structure is affected and therefore the reactivity of surface atoms is different. This course will introduce students to the Chemistry at surfaces, how surface structure is determined and described, what chemical processes occur at surfaces and how this knowledge is applied in particular surface chemistries and surface nanotechnology.