Arrange the following steps in the correct order to describe the process of how ionization potential affects an element's reactivity: A) The element's electron configuration is established; B) The ionization potential is measured; C) The element interacts with other elements; D) The element's ability to form ions is determined.

The element’s electron configuration is first determined, which shows how many valence electrons it has. With that configuration, the ionization potential is measured, indicating how much energy is needed to remove an electron. From the ionization potential, the element’s ability to form ions is assessed, revealing how easily it can lose or gain electrons. Finally, this knowledge of ionization potential and ion‑forming ability explains how the element reacts with others. For example, sodium’s low ionization potential lets it easily give up an electron, making it highly reactive with chlorine.