Question

Which of the following elements exist in monoatomic form?

• A. Neon
• B. Oxygen
• C. Sulphur
• D. Nitrogen

Answer 1

The correct option is A

Neon

Explanation of correct option:

Option (A):

• Atomicity: The number of atoms of an element that combine together to form a molecule of the element.
• Inert gases, metals, metalloids, etc. are formed from a single atom and are called monoatomic elements.
• So, Neon $\left(\mathrm{Ne}\right)$ is an inert gas and exists in monoatomic form.

Explanation of incorrect answer:

Option (B): Diatomic is formed by the combination of two atoms. For example, Oxygen $\left({\mathrm{O}}_2\right)$ is diatomic.

Option (C): Polyatomic are made up of more than three atoms. For example, Sulphur (${\mathrm{S}}_8$) is polyatomic.

Option (D): Nitrogen (${\mathrm{N}}_2$) is formed by the combination of two atoms of nitrogen. So it is diatomic.

Hence, option (A) is the correct answer. Neon exists in monoatomic form.