Question

Which of the follwing should be possible subshell for n+l=7
1)7s,6p,5d,4f
2)4f,5p,6s,4d
3)7s,6p,5d,6d
4)4s,5d,6p,7s

Answer 1

The orbital with lower n has lower energy. Thus the possible answer is 7s, 6p, 5d, 4f