Final answer:
Metals have a regular atomic structure due to the formation of crystals which consists of closely packed atoms in a repeating pattern, manifesting as various properties such as high conductivity and malleability.
Step-by-step explanation:
What we can infer about the structure of metals due to the fact they form crystals is that they have a highly organized and regular atomic structure. The formation of metal crystals implies that metal atoms are packed closely together in a repeating pattern, which manifests as the crystalline solid we observe. Such a regular arrangement is what gives metals their characteristic properties such as malleability and ductility. Moreover, the particular arrangement and size of the atoms within metals such as copper, aluminum, and iron influence the material's specific properties.
The repeating unit within a metallic crystal is a unit cell, which consists of lattice points that represent the positions of atoms or ions. These unit cells repeat in three dimensions to form the entire structure. Metallic bondings hold the atoms together within a metallic solid and contribute to properties such as thermal and electrical conductivity, metallic luster, and strength. The close-packed structures, being the most efficient arrangement of atoms, minimize the empty space between them, which is important for the overall stability of the metal.