The common oxidation state of f-block element | vedclass

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Question

(A) The common oxidation state of $f$-block elements is $+3$. $Eu$ $(Z=63)$ has the electronic configuration $[Xe] 4f^7 6s^2$. It shows a stable $+2$

Vedclass · Accepted Answer

$+2, +4$

Vedclass · Answer

(A) The common oxidation state of $f$-block elements is $+3$. $Eu$ $(Z=63)$ has the electronic configuration $[Xe] 4f^7 6s^2$. It shows a stable $+2$ oxidation state due to the stable half-filled $4f^7$ configuration. $Tb$ $(Z=65)$ has the electronic configuration $[Xe] 4f^9 6s^2$. It shows a stable $+4$ oxidation state due to the stable half-filled $4f^7$ configuration after losing four electrons. Therefore,the other stable oxidation states for $Eu$ and $Tb$ are $+2$ and $+4$ respectively. Hence,option $A$ is the correct answer.

The common oxidation state of $f$-block elements is $+3$. The other stable oxidation states of $^{63}Eu$ and $^{65}Tb$ are respectively:

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