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Anionic Radius

Which of the ...

Question

Which of the following order of atomic/ionic radius is not correct?

A

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

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B

M g^{+ 2} > N a^{+} > F^{-}

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C

P^{+ 5} < P^{+ 3}

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D

L i > B e > B

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Solution

The correct option is A $M g^{+ 2} > N a^{+} > F^{-}$
The order $M g^{+ 2} > N a^{+} > F^{-}$ of ionic radius is not correct.
These are isoelectronic species and each species contains 10 electrons. The correct order of ionic radii is $M g^{+ 2} < N a^{+} < F^{-}$ . The effective nuclear charge decreases in the order $M g^{+ 2} > N a^{+} > F^{-}$ . Hence, the ionic radii increase in the order $M g^{+ 2} < N a^{+} < F^{-}$

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