First slide

Periodicity in atomic properties

Question

Which one of the following is the correct order of the size of the ions?

Moderate

A

${Na}^{+} > {Mg}^{2 +} > F^{-} > O^{2 -}$
B

$O^{2 -} > F^{-} > {Na}^{+} > {Mg}^{2 +}$
C

${Mg}^{2 +} > {Na}^{+} > F^{-} > O^{2 -}$
D

$O^{2 -} > F^{-} > {Mg}^{2 +} > {Na}^{+}$

Solution

For isoelectronic species,
$Ionic radius \propto \frac{1}{atomic number}$
Thus, the correct order will be
$_{8} O^{2 -} >_{9} F^{-} >_{11} {Na}^{+} >_{12} {Mg}^{2 +}$

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