Final answer:
The possible subshell designations are shown using specific examples, and the impossible subshell designations are identified.
Step-by-step explanation:
The possible subshell designations are:
- a) 1s, 2p, 3d, 4f
- b) 2s, 3s, 3p, 4d
- c) 2f, 3p, 4s, 5d
- d) 1p, 2d, 3f, 4s
The impossible subshell designations are: