Final answer:
The dimensional relationship between ionization energy and atomic size is inverse (d).
Step-by-step explanation:
The dimensional relationship between ionization energy and atomic size is inverse (d). Ionization energy refers to the energy required to remove an electron from an atom, while atomic size refers to the size of an atom. When it comes to ionization energy and atomic size, as the size of an atom increases, the ionization energy decreases. Conversely, as the size of an atom decreases, the ionization energy increases. For example, in Figure 4.4.4, the first ionization energy generally increases with increasing atomic number within a period and decreases with increasing atomic number down a group. This trend can be explained by considering the nuclear charge and the energy of the subshells within an atom.