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+
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Correct option is (d) I– > I > I+
Anion is formed by the gain of electron to the neutral atom and cation is formed after the loss of electron from the neutral atom. Hence, cation has smaller size due to increased nuclear charge whereas anion has bigger size than its neutral atom.