2.3 explain the classification of elements as metals or non-metals on the basis of their electrical conductivity and the acid-base character of their oxides

2.3 •metals (left): •conduct electricity because they allow charge to pass through easily 

                            •metal oxides are basic so will neutralise acids

                                     •metal oxides which dissolve will form solutions with a pH more than 7

      •non-metals (right): •poor conductors of electricity 

                                      •non-metal oxides are acidic 

                                                •they dissolve in water to form solutions with a pH of less than 7