The electronic configurations of Eu (Atomic N | vedclass

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Question

(B) The electronic configuration of Lanthanoids follows the general pattern $[Xe] \, 4f^{n} \, 5d^{0-1} \, 6s^2$. For $Eu$ $(Z=63)$: The configuration

Vedclass · Accepted Answer

$[Xe] \, 4f^7 \, 6s^2, [Xe] \, 4f^7 \, 5d^1 \, 6s^2$ and $[Xe] \, 4f^9 \, 6s^2$

Vedclass · Answer

(B) The electronic configuration of Lanthanoids follows the general pattern $[Xe] \, 4f^{n} \, 5d^{0-1} \, 6s^2$. For $Eu$ $(Z=63)$: The configuration is $[Xe] \, 4f^7 \, 6s^2$. For $Gd$ $(Z=64)$: The configuration is $[Xe] \, 4f^7 \, 5d^1 \, 6s^2$ (due to the stability of the half-filled $f$-orbital). For $Tb$ $(Z=65)$: The configuration is $[Xe] \, 4f^9 \, 6s^2$. Thus,the correct option is $B$.

The electronic configurations of $Eu$ (Atomic No. $63$),$Gd$ (Atomic No. $64$) and $Tb$ (Atomic No. $65$) are

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