ion pairion platingion potentialion product constantionicionic bondionic characterionic chromatographyionic compoundionic crystalionic dissociationionic latticeionic mobilityionic polymerizationionic polyrizabilityionic radiusionic ratioionic strengthionizableionizationionization chamberionization constantionization energyionization potentialionization supperssorionizeionizedionized gasiriridiumironiron filingsirradiateirradiationirrational numberirreducible representationirregular polymerirreversibilityirreversibleisdomerphous seriesisentropic processisoableisobarisochoreisoelectronicisoelectronic ionsisoelectronic pointisolated double bondisolated ionisolated system