Noble gases

Definition

Noble gases are a group of chemical elements with similar properties that are found in Group 18 of the periodic table. They are characterized by their lack of reactivity due to having a complete valence electron shell.

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, tasteless, and nonflammable under standard conditions.
3. Noble gases are known for their high ionization energies and very low electronegativities.
4. Due to their lack of reactivity, noble gases do not easily form compounds with other elements.
5. Helium is used in cryogenics and as a cooling medium for nuclear reactors due to its low boiling point.

Review Questions

• What characteristic of noble gases makes them chemically inert?
• List three practical applications of noble gases based on their unique properties.
• Why do noble gases have high ionization energies?

Related terms

Valence Electron:

An electron in the outermost shell of an atom that can participate in forming chemical bonds with other atoms.

Ionization Energy:

The energy required to remove an electron from a gaseous atom or ion.

Electronegativity:

A measure of the tendency of an atom to attract a bonding pair of electrons.