Argon
Sulphur
Phosphorus
Hydrogen
Answer is Right!
Answer is Wrong!
The correct answer is: Argon (A).
A monoatomic molecule is a molecule that consists of only one atom. Argon is an example of a monoatomic molecule because it is a noble gas that exists as a single atom at standard temperature and pressure. The other options are not monoatomic molecules because they are made up of multiple atoms.
Sulphur (B) is a non-metal that exists as a molecule with eight atoms. Phosphorus (C) is a non-metal that exists as a molecule with four atoms. Hydrogen (D) is a gas that exists as a molecule with two atoms.