Here's why:

* Noble gases have a full outer shell of electrons. This makes them incredibly stable and unreactive. They don't need to gain or lose electrons to achieve a stable configuration.

* Chlorine, on the other hand, is a halogen. It has seven electrons in its outer shell and wants to gain one more to achieve a stable octet.

* To react, chlorine would need to pull an electron away from argon. However, argon's full outer shell makes it very difficult to remove an electron.

Therefore, chlorine cannot overcome the stability of argon's electron configuration, and no reaction occurs.