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.
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?????
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1 Answers
anand sinha
·2011-05-09 01:44:14