(C) The ionic radii of trivalent lanthanide ions ($La^{3+}$ to $Lu^{3+}$) decrease due to lanthanide contraction. $La^{3+}$ $(Z=57)$ has the largest r

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$Y^{3+} < Lu^{3+} < Eu^{3+} < La^{3+}$

(C) The ionic radii of trivalent lanthanide ions ($La^{3+}$ to $Lu^{3+}$) decrease due to lanthanide contraction. $La^{3+}$ $(Z=57)$ has the largest radius,while $Lu^{3+}$ $(Z=71)$ has the smallest radius among the lanthanides. $Y^{3+}$ $(Z=39)$ is a $4d$ transition metal ion and is significantly smaller than the $4f$ lanthanide ions. Therefore,the order of ionic radii is $Y^{3+} < Lu^{3+} < Eu^{3+} < La^{3+}$.

Class 12 Chemistry d-and f-Block Elements General Characteristics

Easy

The correct order of ionic radii of trivalent ions $Y^{3+}$,$La^{3+}$,$Eu^{3+}$,and $Lu^{3+}$ is $(Y=39, La=57, Eu=63, Lu=71)$.

TS EAMCET 2022 All TS EAMCET

A
$Lu^{3+} < Eu^{3+} < La^{3+} < Y^{3+}$
B
$La^{3+} < Eu^{3+} < Lu^{3+} < Y^{3+}$
C
$Y^{3+} < Lu^{3+} < Eu^{3+} < La^{3+}$
D
$Y^{3+} < La^{3+} < Eu^{3+} < Lu^{3+}$

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d-and f-Block Elements

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Match the elements in List-$I$ with their electronic configurations in List-$II$.

List-$I$ List-$II$

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$(3)$ $_{24}Cr$ $(C)$ $(n-1)d^2ns^0$

$(4)$ $_{29}Cu$ $(D)$ $(n-1)d^5ns^1$

$(E)$ $(n-1)d^0ns^2$

$(F)$ $(n-1)d^{10}ns^2$

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List-$I$	List-$II$
$(1)$ $Ti^+$	$(A)$ $(n-1)d^4ns^2$
$(2)$ $_{30}Zn$	$(B)$ $(n-1)d^{10}ns^1$
$(3)$ $_{24}Cr$	$(C)$ $(n-1)d^2ns^0$
$(4)$ $_{29}Cu$	$(D)$ $(n-1)d^5ns^1$
	$(E)$ $(n-1)d^0ns^2$
	$(F)$ $(n-1)d^{10}ns^2$

The correct order of ionic radii of trivalent ions $Y^{3+}$,$La^{3+}$,$Eu^{3+}$,and $Lu^{3+}$ is $(Y=39, La=57, Eu=63, Lu=71)$.

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