Which of the following gases is **monoatomic**?

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**Solution:**

1. A **monoatomic gas** consists of single atoms rather than molecules.

2. Among the given options:
   - **Chlorine (Cl₂)** is a diatomic molecule.
   - **Hydrogen (H₂)** is also diatomic.
   - **Oxygen (O₂)** is diatomic as well.
   - **Xenon (Xe)** is a noble gas and exists as single atoms, making it monoatomic.

3. Therefore, the only monoatomic gas in the list is **Xenon**.

**Answer:** Xenon

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