Final answer:
Elements that have 8 electrons in their outermost energy level are considered noble gases. Noble gases are characterized by their low reactivity and stable electron configurations.
Step-by-step explanation:
Elements that have 8 electrons in their outermost energy level are considered noble gases.
Noble gases are a group of chemical elements that are characterized by their low reactivity and stable electron configurations.
Examples of noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe).
Learn more about Noble gases