Which of the following is the largest in size?

B r

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I

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I^{-}

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I^{+}

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Solution

The correct option is C $I^{-}$
Answer : $I^{⊖}$
(1) We know that from top to bottom atomic size is increases. So $I$ its having higher atomic size then $B r$ .
(2) In $I, I^{⊖}$ and $I^{\oplus}$
$I^{⊖}$ have the largest atomic size because $I^{⊖}$ has one extra electron in its valence shell which lead to increase in atomic size.
$∴ I^{⊖} > I > I^{\oplus} > B r$ .

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