ANOMALOUS IONIZATION ENTHALPY OF GROUP 13 ELEMENTS

The general trend in ionization enthalpies should be B>Al>Ga>In>Tl as first I.E. decreases down a group. But the actual trend is B>Al<Ga>In<Tl. why?????

1 Answers

1
anand sinha ·

this is because of poor shielding effect offered by additional 10 d electrons before Gallium.tht is same reason fr small size of gallium than Al even though atomic and ionic radii increase with increase in nuclear charge.

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