Q.

The correct sequence while shows decreasing order of the ionic radii of the elements is

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a

Al3+  >  Mg2+  > Na+  > F−  > O2−

b

Na+  >  Mg2+  > Al3+  > O2−  > F−

c

Na+  >  F−  > Mg2+  > O2−  > Al3+

d

O2−> F−  >  Na+  > Mg2+  > Al3+

answer is D.

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Detailed Solution

O2−, F−,  Na+, Mg2+ and Al3+  are isoelectronic species.For isoelectronic species, r  ∝   1Z Thus, the larger the atomic number (effective nuclear charge) the smaller is the ionic radii.
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The correct sequence while shows decreasing order of the ionic radii of the elements is