Welcome to ChemZipper !!!: The electronegativities of B, Al, Ga are 2.0, 1.5, 1.6 respectively. The trend is not regular. Explain.

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The electronegativities of B, Al, Ga are 2.0, 1.5, 1.6 respectively. The trend is not regular. Explain.

As we go down the period the electronegativity decreases. But after Al, due to the presence of d electrons which have minimum shielding effect, the nuclear charge increases and hence electronegativity also increases.

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