Final answer:
A metallic bond is characterized by the strong electrostatic attraction between positive metal ions and a sea of delocalized valence electrons, forming a crystal lattice structure in metals.
Step-by-step explanation:
A metallic bond is best described as the attraction between positive metal ions and the valence electrons that surround them. In a metallic bond, the positively charged atomic nuclei of metal atoms are attracted to the delocalized electrons. Metals, such as copper, form a crystal lattice structure where each point is occupied by a metal atom that contributes to the sea of mobile valence electrons. This sea of electrons allows for the strong electrostatic attraction that characterizes the metallic bonding between ions and electrons, maintaining a solid structure.