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Chemistry Question on Classification of elements & periodicity in properties

Which one of the following is the correct order of the size of iodine species?

A

I>I+>I+I> I ^{+}> I ^{+}

B

I>I+>I−I > I ^{+} > I ^{-}

C

I+>I−>II ^{+}> I ^{-}> I

D

I−>I>I+I ^{-}> I > I ^{+}

Answer

I−>I>I+I ^{-}> I > I ^{+}

Explanation

Solution

Anions are always larger as compared to the corresponding parent atom as the effective nuclear force of attraction decreases per electron while on losing an electron (cation formation) size shrinks as effective nuclear charge increases per electron.