Question

Elements, P, Q, R and S have the following electronic configurations: P : [Ar]3d104s1 Q : [Ar]3d104s24p65s1 R : [Ar]3d104s24p64d105s1 S: [Ar]3d104s24p64d55s1 Which two elements fall into the same group? (a) Q and R (b) P and R (c) Q and S (d) P and Q

Answer 1

well the answer is P and R

P : [Ar] 3d104s1 is copper - group 11

R:[Ar]3d104s24p64d105s1 is sliver - group 11

Well there can be a whole lot explanation for this question but I suggest that just read the chapter Structure of atom and classification of elements (CBSE class 11 chemistry part 1 ) once then u will be able to solve these types of questions.

Hope my answer helps

Thank you :)