Matching Pairs Periodic Table, Groups, Periods, and Ions - Picture VersionOnline version Find the matches. by Heather Holmes 1 Ions in this set always have a 1- charge. 2 Ionic Compound 3 Elements in this set can form more than one ion . 4 Elements in this set are generally non-reactive. 5 Molecular Compound 6 Ions in this set always have a charge of +1. 7 Ions in this set always have a 2+ charge.