Which among the following lanthanoids shows o | vedclass

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Question

(B) The correct answer is $B$. Lanthanoids generally exhibit a $+3$ oxidation state. However,some elements show $+2$ or $+4$ oxidation states due to t

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Gadolinium

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(B) The correct answer is $B$. Lanthanoids generally exhibit a $+3$ oxidation state. However,some elements show $+2$ or $+4$ oxidation states due to the stability of $f^0$,$f^7$,or $f^{14}$ configurations. Gadolinium $(Gd)$ has the electronic configuration $[Xe] \ 4f^7 \ 5d^1 \ 6s^2$. Upon losing three electrons,it forms $Gd^{3+}$ with the configuration $[Xe] \ 4f^7$,which is a half-filled stable $f$-subshell configuration. Due to this extra stability,$Gd$ predominantly exhibits only the $+3$ oxidation state.

Which among the following lanthanoids shows only $+3$ oxidation state?

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