Real Orbitals (chemistry) Complex Orbitals (physics) Real Combinations (n = 1-4) Complex Combos (n = 1-4) Multiple Bases (n = 2, l = 1) Multiple Bases (n = 3, l = 1) Multiple Bases (n = 3, l = 2) Multiple Bases (n = 4, l = 1) Multiple Bases (n = 4, l = 2) Multiple Bases (n = 4, l = 3) Hybrid Bases