What type of gas is argon categorized as?

Argon is categorized as a noble gas, which is a group of elements characterized by their lack of chemical reactivity. This is primarily due to their complete valence electron shells, which mean they do not readily form bonds with other elements. Noble gases, including argon, helium, neon, krypton, xenon, and radon, are found in Group 18 of the periodic table.

Argon's inert nature makes it useful in various applications, such as providing an unreactive atmosphere for welding and preserving materials. Its properties allow it to exist in gaseous form without easily reacting with other substances or participating in chemical reactions. This distinction from reactive, flammable, or toxic gases highlights the unique characteristics of noble gases and reinforces why argon specifically falls under this category.