Here's why:

* Noble gases are located in Group 18 of the periodic table. They are known for their unreactive nature due to having a full outer shell of electrons.

* Halogens are located in Group 17 of the periodic table. They are highly reactive and tend to gain one electron to achieve a full outer shell.

Helium has a full outer shell of electrons (2 electrons), making it extremely stable and unreactive. This is a characteristic of noble gases.