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Question

(B) The general trend is that ionization energy increases from left to right across a period due to an increase in effective nuclear charge $(Z_{eff})

Vedclass · Accepted Answer

$Mg, Al$

Vedclass · Answer

(B) The general trend is that ionization energy increases from left to right across a period due to an increase in effective nuclear charge $(Z_{eff})$. However,there are exceptions due to stable electronic configurations. For the pair $Mg$ $([Ne] 3s^2)$ and $Al$ $([Ne] 3s^2 3p^1)$,the ionization energy of $Mg$ is higher than that of $Al$ because $Mg$ has a fully filled $s$-orbital,which is more stable. Therefore,the statement is not correct for the pair $Mg, Al$.

"On moving left to right,ionization energy increases due to increasing $Z_{eff}$." In which of the following pairs is the above statement $NOT$ $CORRECT$?

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