dude as far as i'm concerned the answer should be
Boron > Gallium > Alluminium > Thallium > Indium
reasons for the answer:
the size of Gallium is exceptionall smaller than Aluminium due to poor shielding effect of d-electrons in Galium
so definitely 1st of all small size and high charge...so the sum of the ionization energies of gallium has to be more...
and when we go down the factor of inert pair effect comes..
INERT PAIR EFFECT: the inability of the s-electrons to participate in the reactions as we go down the group
so definitely
In +3 > Tl3+
In1+ < Tl1+
so if all the three electrons are taken out from In it wil give readily give to attain stability...
but as for Tl it would prefer to live in Tl1+ state so won't give its electrons easily...
thats the reason why Tl in +1 state acts as a good reducing agent.
hence are reason for the anamolies..hope ya got it
Moderation Team
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