The resulting solid is then filtered and {HEAD ~ ion} exchanged with ions of one or more metals selected from {TAIL ~ those exchangeable metals} from groups IA, IIA, IIIB, IVB, VIB, VIIB, and VIII of the Periodic Table of the Elements 
The resulting solid is then filtered and { HEAD ~ ion } exchanged with ions of one or more metals selected from { TAIL ~ those exchangeable metals } from groups IA , IIA , IIIB , IVB , VIB , VIIB , and VIII of the Periodic Table of the Elements
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH