Dispersive element electrically conducting solid

Metallic Solids Most metallic elements crystallize in one of the two closest packed structures (Figure 12.30). In contrast to the weak dispersion forces in atomic solids, powerM metallic bonding forces hold atoms together in metallic solids. The properties of metals— high electrical and thermal conductivity, luster, and malleability— result from their delocalized electrons (Section 9.1). Melting points and hardnesses of metallic solids are also related to packing efficiency and number of valence electrons. We discuss bonding models that explain these metallic properties in the next two subsections. 

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