Question

Which of the following is the correct order of size of the given species
(a) $I>I^{-}>I^{+}$ (b) $I^{+}>I^{-}I$ (c) $I>I^{+}>I^{-}$ (d) $I^{-}>I>I^{+}$

Answer 1

Answer: (d) $I^{-}>I>I^{+}$

Anion formed after the gain of an electron to the neutral atom and cation formed after the loss of an electron from the outer shell. Hence cation has a smaller size but anion has bigger size than its neutral atom. Thus, $I^{-}>I>I^{+}$.