Nitrogen forms a simple diatomic molecule but other elements of same group do not form. Explain.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Group:**
- Nitrogen belongs to Group 15 of the periodic table, which includes nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi).

2. **Atomic Size Comparison:**
- The atomic size of nitrogen is relatively small compared to the other elements in the same group. This small size allows nitrogen atoms to come close to each other.

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