The first ionisation enthalpies of some elements of group 13are given below: Element Ionisation enthalpy (ink) mol-1) B 801 Al 577 Ga 579 In 558 Ga shows an irregular trend in its first ionisation enthalpy due to a) Poor Shielding effect of 3d electrons b) Poor Shielding effect of 4f electrons c) Larger Size of Ga as compared to Al. d) None of the above
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On moving down the group, the ionization enthalpy decreases. This is true for B and Al.
The ionization enthalpy of Ga is unexpectedly higher than that of Al. Ga contains 10d electrons in inner shell which are less penetrating. Their shielding is less effective than that of s and p electrons. The outer electron is held fairly strongly by the nucleus. The ionization enthalpy increases slightly.
A similar increase is observed from In to TI due to presence of 14f electrons in the inner shell of TI which have poor shielding effect.
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