Here's why:

* Helium (He), the first noble gas, only has one electron shell. It has two electrons in its 1s orbital.

* Neon (Ne) and Argon (Ar) have two electron shells.

* All other noble gases (Kr, Xe, Rn, Og) have at least three electron shells.

Therefore, the statement is only true for all noble gases except Helium and Neon.