The correct sequence which shows decreasing order of the ionic radii of the element is
The correct sequence which shows decreasing order of the ionic radii of the element is
(a) O2– > F– > Na+ > Mg2+ > Al3+
(b) Al3+ > Mg2+ > Na+ > F– > O2–
(c) Na+ > Mg2+ > Al3+ > O2– > F–
(d) Na+ > F– > Mg2+ > O2– > Al3+
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(a) : All the given species are isoelectronic. Among isoelectronic species, anions generally have greater size than cations.
Also greater, the nuclear charge (Z) of the ion, smaller the size. Thus the order is :
O2– > F– > Na+ > Mg2+ > Al3+
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