Which of the following ions is most likely to form an insoluble compound when combined with sulfate ion?

Name: Which of the following ions is most likely to form an insoluble compound when combined with sulfate ion?
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Sr (strontium) is a group 2 metal ion which can form insoluble sulfate compounds (e.g. SrSO4) when combined with sulfate ion. The other ions listed are either group 1 metals (which typically form soluble sulfate compounds) or nonmetals (which do not form sulfate compounds).

Which of the Following Ions Is Most Likely to Form