Question

The number of elements that do not have completely filled d subshell among elements in between $Ni,Pd,Pt,Cu,Ag,Au,Zn,Cd,Hg$

Answer 1

$\begin{array}{cccc}\text{Elements}& \text{Atomic number}& \text{Electronic configuration}& \text{d-orbital}\\ \text{Ni}& \text{28}& \left[Ar\right]3d^{8}4s^2& \text{Incomplete}\\ \text{pd}& \text{46}& \left[Kr\right]4d^{10}& \text{Fully filled}\\ \text{Pt}& \text{78}& \left[Xe\right]4f^{14}5d^{9}6s^1& \text{Incomplete filled}\\ \text{Cu}& \text{29}& \left[Ar\right]3d^{10}4s^1& \text{Fully filled}\\ \text{Ag}& \text{47}& \left[Kr\right]4d^{10}5s^1& \text{Fully filled}\\ \text{Au}& \text{79}& \left[xe\right]4f^{14}5d^{10}6s^1& \text{Fully filled}\\ \text{Zn}& \text{30}& \left[Ar\right]3d^{10}4s^2& \text{Fully filled}\\ \text{Cd}& \text{48}& \left[Kr\right]4d^{10}4s^2& \text{Fully filled}\\ \text{Hg}& \text{80}& \left[Xe\right]4f^{14}5d^{10}6s2& \text{Fully filled}\end{array}$

Hence, Option (b) is correct.