* Inert gases are also known as noble gases. They are located in Group 18 of the periodic table. These elements (Helium, Neon, Argon, Krypton, Xenon, Radon) are exceptionally stable due to their full outer electron shells, making them very unreactive.

* Other pure elements include metals, nonmetals, and metalloids. Many of these elements are highly reactive. For example:

* Sodium (Na) reacts violently with water.

* Chlorine (Cl) is a powerful oxidizing agent.

* Carbon (C) forms countless compounds.

In summary:

* Only the noble gases are inert.

* Most other pure elements are reactive.