Question

Which of the following orbitals are not possible?

• A. 2d
• B. 4f
• C. 4g
• D. 6d

Answer 1

Answer: (A), (C)

The correct options are
A

2d

C

4g

1) 2d is not possible
For d sub-shell l = 2, when n = 2, l can be equal to 0 and 1. Hence, l cannot be 2 for n = 2. Therefore, 2d sub-shell is not possible.
2) 4f is possible
For f sub-shell l = 3, when n = 4, l can be equal to 3.
3) 4g is not possible
For g sub-shell l = 4, when n = 4, l cannot be equal to 4.
4) 6d is possible:
For d sub-shell l = 2, when n = 6, l can be equal to 2.