The face-centered cubic metal lattice allows the closest fit of metal atoms.
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Face-centered cubic metal lattice
A solid set of metal atomic cores bound by metallic bonds is called a metallic lattice. Metal atomic cores are held together by freely moving delocalized electrons. Except for mercury, metals are solid; they conduct electricity and heat well. The machinability of metals depends on the type of crystal structure they contain.
One of the closest packed lattices is the face-centered cubic lattice. Its coordination number is 12: each atom is surrounded by 12 adjacent atoms at equal distances. The atoms that coordinate the central atom are located in three planes.
Metals that crystallize in a face-centered cubic lattice are the easiest to process. Metals with this sort of lattice include calcium, strontium, aluminium, copper, lead, gold and platinum.