Calculate the magnitude 𝐿 of the orbital angular momentum, in multiples of ℏ, of an electron in the atomic orbital 3𝑑.

Answer 1

I assume you mean a small l and not a capital L.
For 3d, n = 3, then "ell or l" can be 0, 1, 2, 3, .....etc with a max of n-1.
So if n = 1, then l = 0 and that is called a s orbital.
If n = 2, then l can be 0 or 1. If l = 1 that is called a p orbital.
If n = 3, then l can be 0, 1, or 2. If l = 2 that is called a d orbital.