Which of the following has the largest ionic radius among group 17 anions?
Ionic radius increases down group 17. Among F⁻, Cl⁻, Br⁻, and I⁻, I⁻ (from I, period 5) has the largest radius.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev