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The correct order of Ionization potential among the Boron group elements is ?

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$B > G a > A l > T l > I n$

$B > T l > A l > G a > I n$

$B > T l > A l > G a = I n$

$B > T l > G a > A l > I n$

answer is A.

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Detailed Solution

The ionization potential of elements of this family follows a irregular trend due to d orbital contraction and f orbital contraction. Ga and Tl & have poor shielding effect of 4f & 3d-orbitals. So they have high ionization potentials.

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