Assertion: The atomic radius of gallium is hi | vedclass

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(D) $1$. The atomic radius of $Al$ is $143 \ pm$ and that of $Ga$ is $135 \ pm$.$2$. Thus, the atomic radius of $Ga$ is smaller than that of $Al$, mak

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If the Assertion is incorrect but the Reason is correct.

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(D) $1$. The atomic radius of $Al$ is $143 \ pm$ and that of $Ga$ is $135 \ pm$.$2$. Thus, the atomic radius of $Ga$ is smaller than that of $Al$, making the Assertion incorrect.$3$. The Reason is correct because the $3d^{10}$ electrons in $Ga$ provide poor shielding of the nuclear charge, leading to a higher effective nuclear charge which pulls the valence shell closer to the nucleus.$4$. Since the Assertion is incorrect and the Reason is correct, the correct option is $D$.

Assertion: The atomic radius of gallium is higher than that of aluminium.
Reason: The presence of additional $d$-electrons offers poor screening effect for the outer electrons from increased nuclear charge.

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Assertion: The atomic radius of gallium is higher than that of aluminium.Reason: The presence of additional $d$-electrons offers poor screening effect for the outer electrons from increased nuclear charge.