The correct sequence which shows decreasing order of the ionic radii of the elements is 

1
Al3+ > Mg2+ > Na+ > F- > O2- 
2
Na+ > Mg2+ > Al3+ > O2- > F- 
3
Na+ > F- > Mg2+ > O2 > Al3+
4
O2- > F- > Na+ > Mg2+ > Al3+ 

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