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. 1
• 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	$\left[Xe\right]4f^{14}5d^{10}6s1$	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	$\left[Xe\right]4f^{14}5d^{10}6s2$	Fully filled

Hence, option (b) is correct.