Question

1. which of the following elements is a noble gas?

helium
oxygen
chlorine
lithium
clear all

Explanation:

Noble gases are elements in Group 18 of the periodic table, characterized by having a full valence electron shell, making them stable and generally unreactive. Helium (He) is a noble gas (Group 18). Lithium is an alkali metal (Group 1), Chlorine is a halogen (Group 17), and Oxygen is a chalcogen (Group 16).

Answer:

Helium (the option with "Helium" text)