Final answer:
Helium, Neon, Argon, Krypton, and Xenon are examples of Noble Gases, which are elements in Group 18 of the periodic table that are unreactive due to their fully satisfied outer electron shells.
Step-by-step explanation:
The elements mentioned in your question, such as Helium, Neon, Argon, Crypton (correct term) and Xenon (correct term) are examples of what's known as Noble Gases. Noble Gases are in the Group 18 (VIII) of the periodic table. They are called noble gases because they are 'noble' or 'inactive'. This means they don't readily engage in chemical reactions because their outer electron shell is fully satisfied, making them stable and nonreactive.
Learn more about Noble Gases