Which of the following is largest
1.Cl-
2.S2-
3.Na+
4.F-

S2- is the largest in size. 
S2- and Cl- have an extra shell than the other two and thus the two largest ions of the four.
S2- and Clare isoelectronic and contain 16 and 17 protons respectively.
In isoeletronic species, the larger ion is one with the less number of protons.

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