The sizes of the following species in the increasing order can be given as:
${M g}^{2 +} < {N a}^{+} < F^{-} < A l$
$F^{-} < A l < {N a}^{+} < {M g}^{2 +}$
$A l < {M g}^{2 +} < F^{-} < {N a}^{+}$
${N a}^{+} < A l < F^{-} < {M g}^{2 +}$

Question

The sizes of the following species in the increasing order can be given as:
${M g}^{2 +} < {N a}^{+} < F^{-} < A l$
$F^{-} < A l < {N a}^{+} < {M g}^{2 +}$
$A l < {M g}^{2 +} < F^{-} < {N a}^{+}$
${N a}^{+} < A l < F^{-} < {M g}^{2 +}$

Toppr Admin · Accepted Answer

For isoelectronic ions- more the charge on cation- lesser is the ionic radius- For Mg2-Z-12-Na-Z-11- F-x2212-Z-9- Thus- F-x2212- has largest size among Mg2-Na-F-x2212- becuase it is anion- More the charge on anion- more the radius-Now Al has higher radius than F-x2212- Hence the increasing order of the size is Mg2-lt-Na-lt-F-x2212-lt-Al

The sizes of the following species in the increasing order can be given as:Mg2+<Na+<F−<AlF−<Al<Na+<Mg2+Al<Mg2+<F−<Na+Na+<Al<F−<Mg2+

The sizes of the following species in the increasing order can be given as:
${M g}^{2 +} < {N a}^{+} < F^{-} < A l$
$F^{-} < A l < {N a}^{+} < {M g}^{2 +}$
$A l < {M g}^{2 +} < F^{-} < {N a}^{+}$
${N a}^{+} < A l < F^{-} < {M g}^{2 +}$