Which of the following will have high ionization potential?

A l^{3 +}

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F^{-}

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N a^{+}

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O^{2 -}

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Solution

The correct option is A $A l^{3 +}$
$A l^{3 +}, N a^{+}, O^{2 -}$ and $F^{-}$ are iso-electronic. I.P is directly proportional to effective nuclear charge. Effective nuclear charge is directly proportional to positive charge. Thus, I.P order is : $A l^{3 +} > N a^{+} > F^{-} > O^{2 -}$ .

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