Arrange the ions N 3-, O 2-, Mg 2+, Na +, and F - in order of increasing ionic radius, starting with the smallest first. N3-, Mg2+, O2-, Na+, F- Mg2+, Na+, F-, O2-, N3- N3-, O2-, F-, Na+, Mg2+ N3-, O2-, Mg2+, F-, Na+