Among the gases mentioned, Nitrogen (N) and Oxygen (O) are predicted to have the most similar properties. This similarity arises from their position in the periodic table and their bonding characteristics.
Nitrogen, which is located in group 15, and Oxygen, found in group 16, are both part of the nonmetals category. They share common characteristics such as being diatomic molecules (N2 and O2), having relatively low boiling and melting points, and existing primarily in gaseous forms at room temperature.
Furthermore, both nitrogen and oxygen are abundant in the atmosphere, comprising about 78% and 21%, respectively. Their similar electronegativities and the ability to form covalent bonds contribute to their comparable chemical behaviors. In contrast, Chlorine (Cl) is a halogen and has different reactivity patterns, while Argon (Ar) and Neon (Ne) are noble gases, known for their lack of reactivity.
Thus, nitrogen and oxygen display the closest properties due to their roles in atmospheric chemistry and similar bonding characteristics.