The elements that are considered inert gases, also known as noble gases, are:

* Helium (He)

* Neon (Ne)

* Argon (Ar)

* Krypton (Kr)

* Xenon (Xe)

* Radon (Rn)

These elements are located in Group 18 (VIIIa) of the periodic table.

Why are they called inert gases?

They are called inert gases because they are very unreactive. This is due to their full outer electron shells, making them very stable and unlikely to form chemical bonds with other elements.

Note: While they were traditionally considered completely inert, it has been discovered that some noble gases can form compounds under specific conditions, particularly xenon.