Orbitals
•Allowed orbitals
–For n =1, l = 0: 1s orbital
–For n = 2, l = 0 or 1: 2s and 2p orbitals
–For n = 3, l = 0, 1, or 2: 3s, 3p, and 3d
orbitals
–For n =4, l = 0, 1, 2, or 3: 4s, 4p, 4d, and 4f orbitals
•Combinations that are not allowed do not exist
(such as 1p, 2d, or 3f)