The elements you listed (He, Ne, and Ar) are all noble gases. They are located in Group 18 (VIIIa) of the periodic table.

Here's why they share those properties:

* Colorless and Odorless: Their electron configuration is very stable, meaning they don't readily gain or lose electrons to form bonds, which is what gives most substances their color and smell.

* Low Chemical Reactivity: Their stable electron configuration makes them extremely unreactive. They don't easily form compounds with other elements.

Therefore, the other element that would have those same properties is krypton (Kr), which is also a noble gas.