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Q.

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

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a

P5+<P3+

b

Li>Be>B

c

I>I>I+

d

Mg2+>Na+>F

answer is B.

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Detailed Solution

The order Mg+2>Na+>F of ionic radius is not correct.
These are isoelectronic species and each species contains 10 electrons. The correct order of ionic radii is Mg+2>Na+>F . The effective nuclear charge decreases in the order Mg+2>Na+>F . Hence, the ionic radii increase in the order Mg+2>Na+>F 

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