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).
A crystalline solid is a type of matter that has its atoms, ions, or molecules arranged in a regular, three-dimensional repeating pattern called a lattice.Having its component units arranged in such a way gives a crystalline solid certain physical characteristics which may vary according to the pattern.ome of these shapes have more than one possible lattice pattern, of which there are 14 total. The units of a crystalline solid lattice, whether they are atoms, ions, or molecules, are bonded to each other, giving the solid a strong structure.