The property that neon and argon most likely share is low or no reactivity.
Neon and argon, being in group 18 of the periodic table, both most likely share the property of low or no reactivity. This is because group 18 elements, also known as noble gases, are characterized by having a complete outer electron shell, which makes them highly stable and unreactive. Because of their stable electron configuration, noble gases do not tend to form chemical bonds with other elements and do not readily engage in chemical reactions. This lack of reactivity is a defining characteristic of noble gases, including neon and argon.
