Name the allotropes of oxygen.

Explanation

### Step-by-Step Solution:

1. **Understanding Allotropes**: Allotropes are different forms of the same element, where the atoms are bonded together in different ways. For oxygen, there are several allotropes.

2. **Identifying the Common Allotropes**:
- The most common allotrope of oxygen is **Dioxygen (O2)**. This is the form of oxygen that we breathe and is present in significant amounts in the Earth's atmosphere. It is a diatomic molecule, meaning it consists of two oxygen atoms.
- Another important allotrope is **Ozone (O3)**. Ozone consists of three oxygen atoms and is found in the Earth's stratosphere, where it plays a crucial role in absorbing harmful ultraviolet radiation from the sun.

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