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