S2- already has a full valence shell and hence it would be difficult to remove an electron from it. Therefore, it is expected to have the highest ionization energy.
Which ion has the smallest ionization energy: S2-, S, or S2+?
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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.