All noble gas molecules are-

Key Points

• Monoatomic gases consist of single atoms.
• Noble gases, such as helium, neon, argon, krypton, xenon, and radon, exist as monoatomic gases under standard conditions.
• These gases are chemically inert due to their complete valence electron shell, which makes them stable and unlikely to form molecules.
• Noble gases are used in various applications such as lighting, welding, and as inert environments for chemical reactions.

Additional Information

• Noble gases are located in Group 18 of the periodic table.
• They are also referred to as inert gases or rare gases.
• The term "noble" reflects their lack of reactivity with other elements.
• Applications of noble gases include neon lights, argon in welding, and helium in balloons and as a coolant in nuclear reactors.
• The discovery of noble gases expanded our understanding of the periodic table and chemical bonding.