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Whereas the electrical properties of a material depend on the internal structure of the atoms, the mechanical properties depend on the types of structures that groups of atoms form. In this context, atomic structures refer to the structures that are built by particular arrangements of atoms, not to the internal structure of individual atoms. All solid materials can be classified on the basis of atomic structure into three groups: amorphous, molecular, or crystalline (in order of increasing importance to mechanical properties). Knowledge of the atomic structure of solids makes it possi­ble to understand why a given material has its unique properties and thus to be able to specify the type of material and the condition it should be in to achieve optimum mechanical properties.