Question

why there is a gradual increase in electronegativity from Al to Tl.​

Answer 1

Answer:

Reason: As we move from Boron to aluminium ,the atomic size increases ,considerably, therefore attraction of nucleus for the electron decreases and hence electronegativity decreases. ... As a result, force of attraction of the nucleus for the electrons increases and hence the electronegativity increases from Al to Tl.

Answer 2

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Your's Answer...

As we move from Boron to aluminium ,the atomic size increases ,considerably, therefore attraction of nucleus for the electron decreases and hence electronegativity decreases. ... As a result, force of attraction of the nucleus for the electrons increases and hence the electronegativity increases from Al to Tl