(Atomic number of 
is 
. Which one of the following given values will be closest to the radius of 
(Atomic number of 
)?
A)
B)
C)
D)
Correct Answer: C
Solution :
\[\operatorname{Ionic} radii \propto \frac{1}{z}\] Thus, \[\frac{{{z}_{2}}}{{{z}_{1}}}\Rightarrow \frac{1.06}{(Ionic\,\,radii\,\,of\,\,L{{u}^{3+}})}\,=\,\,\frac{71}{57}\] \[\Rightarrow \,\,\,\,\operatorname{Ionic}\,\,radii\,\,of\,\,L{{u}^{3+}}=0.85\overset{{}^\circ }{\mathop{A}}\,\]
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