Periodic TableHard

Question

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

Options

A.Al3+ > Mg2+ > Na+ > F- > O2-
B.Na+ > Mg2+ > Al3+ > O2- > F-
C.Na+ > F- > Mg2+ > O2- > Al3+
D.O2- > F- > Na+ > Mg2+ > Al3+

Solution

For isoelectronic species higher the ratio , smaller the ionic radius
for O2 = = 0.8
      F- = = 0.9
      Na+ = = 1.1
      Mg2+ = = 1.2
     Al3+ = = 1.3

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