Metals are ____ of one or more metallic elements (e.g.. iron, aluminum, copper, titanium, gold, nickel), and often also ____ elements (e.g.. carbon, nitrogen, oxygen) in relatively small amounts. Atoms in metals and their ____ are arranged in a very orderly and are relatively dense in comparison to the ceramics and polymers. With regard to mechanical ____, these materials are relatively stiff and strong yet are ductile ,are resistant to fracture, which accounts for their widespread use in ____ applications. Metallic materials have large numbers of nonlocalized electrons—that is, these electrons are not bound to particular ____. Many properties of metals are directly attributable to these electrons. For example, metals are extremely good ____ of electricity and heat, and arc not transparent to visible light; a polished metal surface has a lustrous appearance. In addition, some of the metals (like iron or copper) have desirable ____ properties.

properties of materials II

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