In which of the following pairs, both the elements do not have ( n -1) d ¹⁰ ~ns ~s ^2 configuration?

Step-by-step solution

aligned & Cu :[ Ar ] 3 ~d ¹⁰ 4 ~s ^1 & Zn :[ Ar ] 3 ~d ¹⁰ 4 ~s ^2 & Cd :[ Kr ] 4 ~d ¹⁰ 5 ~s ^2 & Hg :[ Xe ] 4 f ¹⁴ 5 ~d ¹⁰ 6 ~s ^2 & Ag :[ Kr ] 4 ~d ¹⁰ 5 ~s ^1 aligned