The elements in the periodic table that have a completely filled outer subshell are known as noble gases.

Here's why:

* Outermost Electron Configuration: Noble gases have a full outer electron shell (or valence shell). This means they have a stable electron configuration, making them very unreactive.

* Inert Gases: Due to their stable configuration, they are often referred to as "inert gases" because they don't readily form chemical bonds with other elements.

Examples of Noble Gases:

* Helium (He)

* Neon (Ne)

* Argon (Ar)

* Krypton (Kr)

* Xenon (Xe)

* Radon (Rn)