<P> The atoms of metallic substances are typically arranged in one of three common crystal structures , namely body - centered cubic ( bcc ) , face - centered cubic ( fcc ) , and hexagonal close - packed ( hcp ) . In bcc , each atom is positioned at the center of a cube of eight others . In fcc and hcp , each atom is surrounded by twelve others , but the stacking of the layers differs . Some metals adopt different structures depending on the temperature . </P>
<P> The atoms of metallic substances are typically arranged in one of three common crystal structures , namely body - centered cubic ( bcc ) , face - centered cubic ( fcc ) , and hexagonal close - packed ( hcp ) . In bcc , each atom is positioned at the center of a cube of eight others . In fcc and hcp , each atom is surrounded by twelve others , but the stacking of the layers differs . Some metals adopt different structures depending on the temperature . </P>
are pure metals made of atoms or ions
are pure metals made of atoms or ions
atoms
atoms