In severe cases of poison ivy, poison oak, or poison sumac, it is a good idea to see a doctor. Sometimes large blisters need to be drained and sometimes an oral steroid such as prednisone may be useful. Systemic steroids produce rapid resolution of both the itching and the rash.
Crystalline solids have a highly ordered arrangement of constituent atoms, ions or molecules in a three-dimensional layer or lattice giving rise to distinct geometrical shapes. Thee are two important types of crystalline solids. 1  Ionic solids (represented by sodium chloride).
Properties of crystalline solids: 1. These solids have a particular three dimensional geometrical structure. 2. The arrangement order of the ions in crystalline solids is of long order. 3. The strength of all the bonds between different ions, molecules and atoms is equal.