The electronic configuration of gadolinium (a | vedclass

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(B) The electronic configuration of $La$ $(Z=57)$ is $[Xe] 5d^1 6s^2$. Following this,the $4f$ orbitals are filled. Europium ($Eu$,$Z=63$) has a stabl

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$[Xe]4f^7 5d^1 6s^2$

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(B) The electronic configuration of $La$ $(Z=57)$ is $[Xe] 5d^1 6s^2$. Following this,the $4f$ orbitals are filled. Europium ($Eu$,$Z=63$) has a stable half-filled $4f$ subshell with the configuration $[Xe] 4f^7 6s^2$. For Gadolinium ($Gd$,$Z=64$),the next electron enters the $5d$ orbital instead of the $4f$ orbital to maintain the stability of the half-filled $4f^7$ configuration. Therefore,the electronic configuration of $Gd$ $(Z=64)$ is $[Xe] 4f^7 5d^1 6s^2$.

List-$I$ (Elements)	List-$II$ (Group)
$A$. $Mn, Tc, Re$	$IV$. $7$
$B$. $Zn, Cd, Hg$	$I$. $12$
$C$. $Ti, Zr, Hf$	$II$. $4$
$D$. $Ga, In, Tl$	$V$. $13$

The electronic configuration of gadolinium (atomic no. $64$) is

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