Which one of the elements of group-13 has the lowest ionization energy?

Aluminium

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Gallium

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Indium

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Thallium

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Solution

The correct option is C Indium
Indium, order of first ionization energy in group-13 is:- $B > T l > G a > A l > I n$
This is because of the poor shielding of d and f electrons.

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