D-And F-Block Elements Ques 507
Question: The radius of $ L{{a}^{3+}} $ (Atomic number of La = 57) is $ 1.06\overset{o}{\mathop{A}}, $ . Which one of the following given values will be closest to the radius of $ L{{a}^{3+}} $ (Atomic number of Lu= 71)-
Options:
A) $ 1.40\overset{o}{\mathop{A}}, $
B) $ 1.06\overset{o}{\mathop{A}}, $
C) $ 0.85\overset{o}{\mathop{A}}, $
D) $ 1.60\overset{o}{\mathop{A}}, $
Show Answer
Answer:
Correct Answer: C
Solution:
$ Ionicradii,\propto \frac{1}{z} $ Thus, $ \frac{z_2}{z_1}\Rightarrow \frac{1.06}{(Ionic,radii,of,L{{u}^{3+}})}=\frac{71}{57} $
$ \Rightarrow $ Ionic radii of $ L{{u}^{3+}}=0.85\overset{o}{\mathop{A}}, $
