human is a mean of organisms & seeing is a mean of part ->  sodium and chlorine are two elements  sodium and chlorine are two elements & toaster rest is made of types and sample chemically combined ->  sodium chloride is made of two elements chlorine and sodium chemically combined  sodium chloride is made of two elements chlorine and sodium chemically combined & physical pecan are formed by chemically vehicle tunnels ->  chemical bonds are formed in sodium and chlorine elements  chemical bonds are formed in sodium and chlorine elements & an sample is made of zero mean of rust -> chemical bonds are formed among sodium atom and chlorine atoms