Which element from the following lanthanoids | vedclass

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(A) The electronic configuration of lanthanoids follows the general pattern $(Xe)4f^{n} 5d^{0-1} 6s^{2}$.$A$ half-filled $f$-orbital corresponds to $f

Vedclass · Accepted Answer

$Eu$

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(A) The electronic configuration of lanthanoids follows the general pattern $(Xe)4f^{n} 5d^{0-1} 6s^{2}$.$A$ half-filled $f$-orbital corresponds to $f^{7}$.Looking at the provided table:- $Ce$ $(Z=58)$: $(Xe)4f^{1} 5d^{1} 6s^{2}$- $Pm$ $(Z=61)$: $(Xe)4f^{5} 6s^{2}$- $Sm$ $(Z=62)$: $(Xe)4f^{6} 6s^{2}$- $Eu$ $(Z=63)$: $(Xe)4f^{7} 6s^{2}$Since $Eu$ has $4f^{7}$,it possesses a half-filled $f$-orbital. This configuration is stable and matches the expected filling order for this element.

Which element from the following lanthanoids has a half-filled $f$-orbital in its observed and expected electronic configuration?

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