The Solid State Notes Chemistry

The Solid State Notes Chemistry1. Solids are substances which have fixed shapeand volume. 1’hey are characterised by rigidity, incompressibility, slow diffusion and mechanical strength. They are classified as:(a) Crystalline solids(b) Amorphous solids .2. The crystalline solids are further classified as:(a) Metallic solids(b) Ionic solids(c) Covalent solids(d) Molecular solids3. A regular three dimensional arrangement of points in space is called a space lattice or crystal lattice. There are only 14 three-dimensional lattices known as Bravais lattices. The basic difference between the 14 Bravais lattices are the angles between the faces and the relative proportion of the sides.4. A unit cell is the smallest unit of the crystal which when repeated again and again gives the crystal of the given substance.5. There are three types of unit cells based on the cube. These are:(a) Primitive or simple cube which has one constituent at each comer.(b) Body-centred cube in which one constituent at the centre of the cube as well as one at each comer.(c) Face-centred cube in which there is one constituent at the centre of each face as well as one at each comer.6. A pure metal in the solid crystalline state is composed of atoms that are identical in shape