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

  • Al3+ > Mg2+ > Na+ > F- > O2-

  • Na+ > Mg2+ > Al3+ > O2- > F-

  • Na+ > F- > Mg2+ > O2- > Al3+

  • O2- >F- > Na+ > Mg2+ >Al3+

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