(D) The correct answer is $D$. Due to the lanthanoid contraction,the atomic radii of elements in the $5d$ series are nearly the same as those of the c

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Atomic sizes of elements of the $5d$ series are greater than corresponding $4d$ series

(D) The correct answer is $D$. Due to the lanthanoid contraction,the atomic radii of elements in the $5d$ series are nearly the same as those of the corresponding elements in the $4d$ series. Therefore,the statement that the atomic sizes of the $5d$ series are greater than the $4d$ series is incorrect.

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

Easy

Which statement is incorrect from the following?

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A
$CrO$ is basic,but $Cr_2O_3$ is amphoteric
B
$Cd$ is not considered as a transition element
C
Atomic sizes of elements of the $4d$ series are greater than corresponding elements of the $3d$ series
D
Atomic sizes of elements of the $5d$ series are greater than corresponding $4d$ series