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 2+ charge. 2 Molecular Compound 3 Ionic Compound 4 Ions in this set always have a 1- charge. 5 Elements in this set are generally non-reactive. 6 Elements in this set can form more than one ion . 7 Ions in this set always have a charge of +1.