* Helium (He)
* Neon (Ne)
* Argon (Ar)
* Krypton (Kr)
* Xenon (Xe)
* Radon (Rn)
Why are noble gases monatomic?
Noble gases have a full outer shell of electrons, making them very stable and unreactive. They have no tendency to gain, lose, or share electrons to form bonds with other atoms. Therefore, they exist as single atoms (monatomic) in nature.
Important Note: Some other elements can exist as monatomic gases under certain conditions, but they are not naturally monatomic. For example, oxygen (O2) can be broken down into atomic oxygen (O) under high temperatures, but this is not the natural state of oxygen.
