Question

Arrange the following elements in their increasing order of atomic radii:

Answer 1

Answer: $Sc>Zn>Cu>Ni$
Solution:
For the $3d$ elements, the expected decrease in atomic radius is observed from $Sc\text{to}V,$ thereafter up to $Ni$ the atomic radius nearly remains the same and then increases till $Zn$. So the atomic radii increase from $Ni\text{to}Cu\text{to}Zn.$