The atomic radius of gallium is less than tha | vedclass

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(C) The atomic radius of gallium ($Ga$,$Z=31$) is slightly smaller than that of aluminium ($Al$,$Z=13$).This is because,in gallium,the $3d$-orbitals a

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Poor shielding power of $d$-electrons of gallium

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(C) The atomic radius of gallium ($Ga$,$Z=31$) is slightly smaller than that of aluminium ($Al$,$Z=13$).This is because,in gallium,the $3d$-orbitals are filled before the $4p$-orbital.These $d$-electrons have a poor shielding effect compared to $s$- and $p$-electrons.As a result,the effective nuclear charge increases,which pulls the valence electrons closer to the nucleus,leading to a decrease in the atomic radius.

The atomic radius of gallium is less than that of aluminium. This is due to

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