One form of these entities is often analogized to “onion skin,” where the empty space between layers represents these entities’ radial nodes. Slater-type functions represent (10[1])these entities in the Hartree–Fock method for determining their coefficients; that method involves taking a linear combination of these entities. Spin multiplicity is maximized in the occupation of these entities according to Hund’s rule. The tetrahedral geometry and identical bonds of methane are due to the hybridization of four of these entities, three of which have a characteristic dumbbell shape. For 10 points, the s, p, d, and f types of what regions surrounding the nucleus are occupied by electrons? ■END■