This subject teaches basic principles of solid state chemistry and shows how they can be used to describe the materials properties. In particular, the relationship between electronic structure, chemical bonding, and crystal structure is developed. The physical properties of the solid such as magnetic, electrical, optical, etc. are introduced and related to their electronic and crystal structure. Tentative topical coverage: Crystal structures, chemical bonding in solids (llic, covalent, ionic), non-bonding electrons (d- and f-electrons, crystal field), defects in solids, electrical properties (llic conductivity, semiconductivity, superconductivity, ionic conductivity, ferroelectricity, piezo electricity, optical properties (d- and f-electrons) and magnetic properties.