{TAIL ~ The alkali metal cations} then accept electrons from electrode 18 and return to {HEAD ~ their elemental state} 
{ TAIL ~ The alkali metal cations } then accept electrons from electrode 18 and return to { HEAD ~ their elemental state }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD