Discussion
The set of elements which has exceptional electronic configurations not obeying Aufbau principle is
Answer: D
The set is Cr, Cu, Ag & Ru.
Each of these has a configuration that departs from the Aufbau order: Cr is 3d54s1 (not 3d44s2), Cu is 3d104s1, Ag is 4d105s1 and Ru is 4d75s1. Half-filled and filled d subshells, and the closeness of the (n-1)d and ns energies, explain these.
Every other set contains a normal element: K (4s1), Ca (4s2) and Na (3s1) all follow the Aufbau order, which rules out the other four options.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development