Question

The correct sequence which shows decreasing order of the
ionic radii of the elements is
(a) Al3+ > Mg2+ > Na+ > F– > 02-
(b) Na+ > Mg2+ > Al3+> 02->F
(C) Na+ > F– > Mg2+ > 02- > Al3+
(d) O2-> F- > Na+ > Mg2+ > Al3+​

Answer 1

Answer:

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+