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18/09/2020 7:36 pm
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The ionic radii of O2–, F–, Na+ and Mg2+ are in the order :
(1) O2– > F– > Na+ > Mg2+
(2) F– > O2– > Na+ > Mg2+
(3) O2– > F– > Mg2+ > Na+
(4) Mg2+ > Na+ > F– > O2–
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18/09/2020 7:47 pm
(1) O2– > F– > Na+ > Mg2+
Explanation:
O2– F– Na+ Mg2+
Z 8 9 11 12
No. of e– 10 10 10 10
In isoelectronic species greater is Z smaller is radius so order is O2– > F– > Na+ > Mg2+.