If the ionic radius of _{57}La^{3+} is 1.06 | vedclass

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(C) The phenomenon of lanthanoid contraction refers to the steady decrease in the ionic radii of lanthanoids from $La^{3+}$ $(Z=57)$ to $Lu^{3+}$ $(Z=

Vedclass · Accepted Answer

$0.85$

Vedclass · Answer

(C) The phenomenon of lanthanoid contraction refers to the steady decrease in the ionic radii of lanthanoids from $La^{3+}$ $(Z=57)$ to $Lu^{3+}$ $(Z=71)$.
As the atomic number increases,the shielding effect of $4f$ electrons is poor,leading to an increase in the effective nuclear charge,which pulls the electrons closer to the nucleus.
Since $_{57}La^{3+}$ has a radius of $1.06 \ \mathring{A}$,the radius of $_{71}Lu^{3+}$ must be smaller than $1.06 \ \mathring{A}$ due to lanthanoid contraction.
Among the given options,$0.85 \ \mathring{A}$ is the only value smaller than $1.06 \ \mathring{A}$.

If the ionic radius of $_{57}La^{3+}$ is $1.06 \ \mathring{A}$,then the ionic radius of $_{71}Lu^{3+}$ will be approximately close to which of the following values in $\mathring{A}$?

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