Noble gases

Definition

Noble gases are a group of inert, nonreactive elements in Group 18 of the periodic table. They are characterized by having complete valence electron shells, making them highly stable.

5 Must Know Facts For Your Next Test

1. Noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
2. They are colorless, odorless, and tasteless under standard conditions.
3. Noble gases have very low chemical reactivity due to their filled outer electron shells.
4. Helium is used in cryogenics and as a cooling medium for nuclear reactors.
5. Argon is commonly used in welding and in incandescent light bulbs to prevent oxidation of the filament.

Review Questions

• Why are noble gases chemically inert?
• List all the elements that are classified as noble gases.
• What is one common industrial use of argon?

Related terms

Periodic Table:

A tabular arrangement of elements based on atomic number, electron configurations, and recurring chemical properties.

Valence Electrons: The electrons present in the outermost shell of an atom that determine its chemical reactivity.

Inert Gas: A gas that does not undergo chemical reactions under a set of given conditions; often synonymous with noble gas.