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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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 $\mathring{A}$?

Similar Questions

What does lanthanoid contraction result in?

The most common oxidation state of Lanthanoid elements is $+3$. Which of the following is likely to deviate easily from $+3$ oxidation state?

The electronic configurations of bivalent europium and trivalent cerium are
(atomic number : $Xe=54, Ce=58, Eu=63$ )

The correct basicity order of the following lanthanide ions is

Which element from the following has a half-filled $f$ orbital in the $+3$ oxidation state?

Vedclass Test Series

Exam Paper Generator

Online Exam Module