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