Write one example of each of the following:-
Monoatomic molecules

Explanation

**Step-by-Step Solution:**

1. **Understand the Definition**: A monoatomic molecule is defined as a molecule that consists of only one atom.

2. **Identify Examples**: The most common examples of monoatomic molecules are the noble gases. These gases exist as single atoms rather than as molecules made up of multiple atoms.

3. **List the Examples**:
- Helium (He)
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