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firstly boron due to its small size has highest electronegativity in the group.Next Al , has larger size and atomic radii so electronegativity decreases.

But in Ga due to the presence of 10 d-electrons , the shielding effect gets reduced.

As a result the attraction due to the nuclear charge increases.

The same happens with In and Tl.

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Related Questions

What is the trend in electronegativity of elements when going down the group?

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