Question

Which combinations of n and l represent real orbitals, and which do not exist
a) 2s
b) 3p
c) 5s
d) 1d

Answer 1

The orbitals are 1s, 2s, 2p, 3s, 3p, 3d, 4,s 4p, 4d, 4f, 5s, 5p, 5d, 5f, 6s, 6p, 6d, 7s, and 7p.

The one that doesn't exist is d) 1d.