The correct order of the first ionization ent | vedclass

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Question

(D) $(i)$ The first ionization enthalpy $(IE_1)$ decreases down the group from $B$ to $Al$ due to an increase in atomic size. $(ii)$ From $Al$ to $Ga$

Vedclass · Accepted Answer

$Tl > Ga > Al$

Vedclass · Answer

(D) $(i)$ The first ionization enthalpy $(IE_1)$ decreases down the group from $B$ to $Al$ due to an increase in atomic size. $(ii)$ From $Al$ to $Ga$,the $IE_1$ increases due to the poor shielding effect of $d$-electrons (scandide contraction). $(iii)$ From $Ga$ to $Tl$,the $IE_1$ increases due to the poor shielding effect of $f$-electrons (lanthanide contraction). $(iv)$ Combining these trends,the correct order is $Tl > Ga > Al$.

The correct order of the first ionization enthalpy is

Similar Questions

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The successive $5$ ionisation energies of an element are $800, 2427, 3658, 25024$ and $32824 \ kJ/mol$,respectively. By using the above values,predict the group in which the above element is present:

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