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Arrange the ions Be^2+, F^-, Mg^2+, S^2-, Cl^- in order of increasing size. 1. Be^2+, Mg^2+, F^-, Cl^-, S^2- 2. Impossible to predict. 3. Be^2+, F^-, Mg^2+, S^2-, Cl^- 4. F^-, Be^2+, Mg^2+, Cl^-, S^2- 5. S^2-, F^-, Cl^-, Mg^2+, Be^2+