Figure 11.1 depicts how these two trends in increasing energy relate. In any atom with two or more electrons, the repulsion between the electrons makes energies of subshells with different values of l differ so that the energy of the orbitals increases within a shell in the order s < p < d < f. The energy of atomic orbitals increases as the principal quantum number, n, increases. The specific arrangement of electrons in orbitals of an atom determines many of the chemical properties of that atom. This allows us to determine which orbitals are occupied by electrons in each atom. Having introduced the basics of atomic structure and quantum mechanics, we can use our understanding of quantum numbers to determine how atomic orbitals relate to one another.
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