Classify the elements based on atomicity with examples.

Explanation

To classify elements based on atomicity, we need to understand what atomicity means. Atomicity refers to the number of atoms present in a molecule of an element. Based on atomicity, elements can be classified into three main categories: monatomic, diatomic, and polyatomic.

### Step-by-Step Solution:

1. **Define Atomicity**:
- Atomicity is the number of atoms in a molecule of an element.

2. **Classify Elements**:
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