![]() ![]() In others, the atoms share electrons and form covalent bonds. For example, in a crystal of sodium chloride (common salt), the crystal is made up of ionic sodium and chlorine, and held together with ionic bonds. The forces between the atoms in a crystal can take a variety of forms. Likewise, crystalline materials often have electrical, magnetic, optical, or mechanical properties that can be exploited for engineering purposes. Primarily, this is because the periodicity of atoms in a crystal - its defining characteristic - facilitates mathematical modeling. The bulk of solid-state physics, as a general theory, is focused on crystals. Depending on the material involved and the conditions in which it was formed, the atoms may be arranged in a regular, geometric pattern ( crystalline solids, which include metals and ordinary water ice) or irregularly (an amorphous solid such as common window glass). hardness and elasticity), thermal, electrical, magnetic and optical properties of solids. ![]() These interactions produce the mechanical (e.g. Solid materials are formed from densely packed atoms, which interact intensely. It also has direct applications, for example in the technology of transistors and semiconductors. Thus, solid-state physics forms a theoretical basis of materials science. Solid-state physics studies how the large-scale properties of solid materials result from their atomic-scale properties. It is the largest branch of condensed matter physics. Solid-state physics is the study of rigid matter, or solids, through methods such as quantum mechanics, crystallography, electromagnetism, and metallurgy. For theories in political science, see State (polity).
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