Final answer:
The region that contains the least readily oxidized elements is the noble gases.
Step-by-step explanation:
The region that contains the least readily oxidized elements is the noble gases. Noble gases are located in Group 18 of the periodic table and have a full outermost electron shell. This makes them very stable and unreactive, which means they are less likely to undergo oxidation. Examples of noble gases include helium, neon, and argon.