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  4. Ionisation enthalpy (ΔiHi kj mol-1) for the elements of Group 13 follows the order

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Q. Ionisation enthalpy $(\Delta_{i}H_{i}\, kj\, mol^{-1})$ for the elements of Group $13$ follows the order

The p-Block Elements

Solution:

The decrease in ionisation enthalpy from $B$ to $Al$ is associated with increase in size. The observed discontinuity in the ionisation enthalpy values between $Al$ and $Ga$, and between $In$ and $Tl$ are due to inability of $d$ -and $f$-electrons, which have low screening effect, to compensate the increase in nuclear charge.