Consider the isoelectronic species, Na+, Mg2+, F and O2–. The correct order of increasing length of their radii is _________.

1
F- < O2– < Mg2+ < Na+
2
Mg2+ < Na+ < F < O2– 
3
O2– < F < Na+ < Mg2+
4
O2– < F < Mg2+ < Na+
5
Not Attempted

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