How would you explain the lower atomic radius | vedclass

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(B) Although $Ga$ has one shell more than $Al$,its atomic radius is slightly smaller than that of $Al$. This is due to the poor shielding effect of th

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Due to poor shielding effect of $3d$-electrons

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(B) Although $Ga$ has one shell more than $Al$,its atomic radius is slightly smaller than that of $Al$. This is due to the poor shielding effect of the $3d$-electrons. The $d$-electrons do not shield the valence electrons effectively from the nuclear charge. Consequently,the effective nuclear charge experienced by the valence electrons in $Ga$ is significantly higher than in $Al$,which pulls the valence shell closer to the nucleus.

How would you explain the lower atomic radius of $Ga$ as compared to $Al$?

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