In metallic colids, the forces of attraction are between the mobile valence electrons and

In metallic colids, the forces of attraction are between the mobile valence electrons and the positively charged nuclei. In a metallic solid, the outermost valence electrons of metal atoms are not tightly bound to their respective atoms, but instead, they move freely throughout the entire crystal structure. These electrons are referred to as delocalized electrons. The positive metal ions are arranged in a lattice structure and are surrounded by these delocalized electrons. These electrons are attracted to the positively charged nuclei, which keeps the metal ions together in the lattice structure. Therefore, the forces of attraction in metallic colids are between the mobile valence electrons and the positively charged nuclei.