1.38 understand that a metal can be described as a giant structure of positive ions surrounded by a sea of delocalised electrons

1.38 •metals have a giant, three-dimensional lattice structure where positive ions are arranged in a regular pattern in a ‘sea of electrons’ 

                  •the electrons are detached and are delocalised throughout thestructure

         •the attraction between the positive ions and the delocalised electrons is known as a metallic bond 

                   •this attraction keeps the ions together