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Ionic radii of following species are
$$ Si^{4}+ > P^{5}+ > S^{6}+ > Cl^{7}+$$
$$ Si^{6}+ > P^{5}+ > Si^{4}+ > Al^{3}+$$
$$ N^{3}- > O^{2}- > F^- > Na^{1}+$$
$$ Mg^{2}+ > Na^{1}+ > F^- > O^{2}- $$
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