Here's why:

* Non-reactive: Noble gases are known for their extremely low reactivity due to their full outer electron shells.

* Colorless gas: All noble gases are colorless and odorless at standard conditions.

Where to find them in the periodic table:

Noble gases are located in Group 18 (also known as Group VIIIA) of the periodic table. This group includes:

* Helium (He)

* Neon (Ne)

* Argon (Ar)

* Krypton (Kr)

* Xenon (Xe)

* Radon (Rn)