Non-crystalline or amorphic solids whose particles are arranged in a hap hazard manner. Most of our comments will concern the crystalline solids. Ionic solids have high melting and boiling points because of the ion-ion forces holding these ions in the structure.
Ionic solids are soluble in polar water for the most part.
There are a number of exceptions that make up a set of rules called the solubility rules. Molecular crystalline solids have as their particles neutral molecules. The forces holding these molecules in the crystal structure are the intermolecular forces . Because these forces are not as strong as the ion-ion forces in ionic solids, molecular solids tend to have lower melting and boiling points compared to ionic solids. Some molecular solids undergo the process known as ionization where the molecules are torn apart by the attraction of solvent molecules during the solution formation process.