Which group includes helium, argon, krypton, and xenon?

The group that includes helium, argon, krypton, and xenon is known as the noble gases. These elements are characterized by their full valence electron shells, which make them highly stable and largely inert under standard conditions. This stability results in their lack of chemical reactivity with other elements, which is a defining trait of noble gases.

Noble gases are situated in Group 18 of the periodic table and are primarily found in the atmosphere in small amounts. The other groups listed consist of different types of elements: halogens, for instance, are highly reactive nonmetals found in Group 17; alkaline earth metals are in Group 2 and are known for their reactivity, particularly with water; while metalloids exhibit properties intermediate between metals and nonmetals but are not related to the behavior of noble gases.