In which one of the following pairs, both the elements does not have (n-1) d¹⁰ n s^2 configuration in its elementary state?

Step-by-step solution

Among the given elements copper and does not have (n-1) d¹⁰ n s^2 configuration while zinc have this configuration in its elementary state. Thus in option (d) both the elements don't have (n-1) d¹⁰ n s^2 configuration aligned & Cu 4 ~s ^1 3 d¹⁰ & Zn 4 ~s ^2 3 d¹⁰ aligned