As electrons flow through the external circuit, schematically indicated by reference numeral 26, {HEAD ~ alkali metal} 16 passes through {TAIL ~ electrolyte tube} 14 in the form of cations 
passes through
As electrons flow through the external circuit , schematically indicated by reference numeral 26 , { HEAD ~ alkali metal } 16 passes through { TAIL ~ electrolyte tube } 14 in the form of cations
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH