The pair with the greatest coulombic attraction is required.
The pair that will have the greatest coulombic attraction is 3. [tex]Mg^{2+}[/tex] and [tex]O^{2-}[/tex].
The factor which will determine the Coulombic attraction is the size of the ion or ionic radius.
It is an inverse relation.
The smaller the radius the larger the attractive force will be.
The Magnesium ion will have the same radius in all the pairs.
The ionic radius of
[tex]S^{2-}=184\ \text{pm}[/tex]
[tex]Se^{2-}=198\ \text{pm}[/tex]
[tex]O^{2-}=140\ \text{pm}[/tex]
[tex]O^{2-}[/tex] has the smallest ionic radius.
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