What are the different isotopes of oxygen? Write their symbols and draw their complete structures. In what respects do they differ from each other?

Explanation

### Step-by-Step Solution

1. **Understanding Isotopes**:
- Isotopes are atoms of the same element that have the same atomic number but different mass numbers. This means they have the same number of protons but a different number of neutrons.

2. **Identifying Isotopes of Oxygen**:
- Oxygen has three main isotopes:
- Oxygen-16 (O-16)
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