Question

The number of elements that do not have completely filled d subshell among the elements $Ni,Pd,Pt,Cu,Ag,Au,Zn,Cd\text{and}Hg$ are:

• A. $3$
• B. $2$
• C. $4$
• D. $5$

Answer 1

The correct option is B $2$

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

Hence, answer is 2.