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).
1 Amorphous Solids. 2  Unlike all of the other types of solids, amorphous solids do not exhibit a crystal structure. 3  This type of solid is characterized by having an irregular bonding pattern. 4  Amorphous solids may be soft and rubbery when they are formed by long molecules, tangled together and held by intermolecular forces.