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(D) For group $13$ elements,the electronegativity $(EN)$ values on the Pauling scale are as follows:$B: 2.0$$Al: 1.5$$Ga: 1.6$$In: 1.7$$Tl: 1.8$As we

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(D) For group $13$ elements,the electronegativity $(EN)$ values on the Pauling scale are as follows:$B: 2.0$$Al: 1.5$$Ga: 1.6$$In: 1.7$$Tl: 1.8$As we move down the group from $B$ to $Al$,the electronegativity decreases due to the increase in atomic size.However,from $Al$ to $Tl$,the electronegativity increases gradually due to the poor shielding effect of $d$ and $f$ orbitals,which increases the effective nuclear charge.Therefore,the correct variation is a decrease from $B$ to $Al$,followed by an increase from $Al$ to $Tl$.

Which one of the following correctly represents the variation of electronegativity $(EN)$ with atomic number $(Z)$ of group $13$ elements?

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