Electronegativity of elements of group 13 decreases from B to Al and then increases marginally because of discrepancies in

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atomic radii

protons in nuclei

electrons in valence shell

all of these

answer is A.

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Detailed Solution

The size of the atom is inversely related to the electronegativity, the electronegativity is found to be decreasing as we move from B to Al and then increases further due to poor shielding effect. This is also known as discrepancies in the atomic size of the element.

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