In lanthanides,with an increase in atomic num | vedclass

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(B) In the lanthanide series,the atomic radius generally decreases as the atomic number increases due to the poor shielding effect of $4f$ electrons,a

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$Eu$

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(B) In the lanthanide series,the atomic radius generally decreases as the atomic number increases due to the poor shielding effect of $4f$ electrons,a phenomenon known as lanthanide contraction.However,elements like $Eu$ $(Europium)$ and $Yb$ $(Ytterbium)$ show an anomaly in this trend.$Eu$ has a stable half-filled $4f^7$ configuration,which results in a larger atomic radius compared to the expected trend because the metallic bonding is weaker due to the involvement of fewer electrons in the bonding process.Therefore,the element $\underline{X}$ is $Eu$.

In lanthanides,with an increase in atomic number,the atomic radius decreases,except for the element $\underline{X}$. What is $\underline{X}$?

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