Q. The correct sequence which shows decreasing order of the ionic radii of the elements is
A) $Al^{3 +} > Mg^{2 +} > Na^{+} > F^{-} > O^{2 -}$
B) $Na^{+} > Mg^{2 +} > Al^{3 +} > O^{2 -} > F^{-}$
C) $Na^{+} > F^{-} > Mg^{2 +} > O^{2 -} > Al^{3 +}$
D) $O^{2} > F^{-} > Na^{+} > Mg^{2 +} > Al^{3 +}$
Explanation
(d)
$O^{2 -},\ F^{-},Na^{+},Mg^{2 +}and\ Al^{3 +}$ are isoelectronic species and higher the nuclear charge, smaller the size of isoelectronic species.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.