Electricity is defined the flow of electron.Then why the non metal do not conduct the electricity.
The reactivity of metals depends on the ease with which they lose electrons. The most reactive metal atoms (K, Na, Ca, ) lose electrons easily to form positive ions. Less reactive metals such as Cu and Ag do not lose electrons easily. In the reactions you are thinking about more reactive metals will displace less reactive metals from solutions of their salts because they are able to 'force' the less reactive metal ion to take electrons and the less reactive metals are displaced from teh solution eg Zn (s) + Cu2+(aq) ---> Zn2+(aq) + Cu Zn atoms give 2 electrons to Cu2+ ions
