Question

for n = 3, what are the possible sub levels? I'm guessing it's 0,1,2 but I wanna make sure.

Answer 1

different sublevels are s (l=0), p (l=1), d (l=2) and f (l=3)
So n=3 has 3 sub levels (3s (0), 3p (1) and 3d (2))

So you are guessing right

Answer 2

Thank you!