Which one of these ions has the largest radius? A) Cl^- B) K⁺ C) S^2- D) Na⁺ E) O^2-

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In general, ions with more electrons have larger radii because there is greater electron-electron repulsion that causes the electron cloud to spread out. Of the options given, sulfur (S) has the most electrons, with a full valence shell of 6 and two additional inner shells of 8 and 2 electrons, respectively. Therefore, the ion with S will have the largest radius. Option C has two S ions, making it the largest ion.

Which One of These Ions Has the Largest Radius