What is a characteristic of crystalline solids?

A characteristic of crystalline solids is that they form crystals with organized aggregates of molecules. This organized structure is a defining feature of crystalline solids, where the atoms, molecules, or ions are arranged in a highly ordered pattern that extends in three dimensions. This orderly arrangement results in distinct geometric shapes when the solid crystallizes, leading to uniform properties throughout the material.

In contrast, disorganized structures are typical of amorphous solids, which do not have the long-range order found in crystalline solids. Flow properties due to secondary bonds would not accurately describe crystalline solids, as these properties are more associated with liquids or certain types of amorphous materials. Finally, the idea that crystalline solids consist mainly of liquid mixtures is incorrect; crystalline solids are typically solid at room temperature and consist of a fixed composition rather than a mixture of liquids.