Nitrogen is relatively inert as compared to phosphorus. Why ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Elements**:
- Nitrogen (N) and Phosphorus (P) are both elements found in Group 15 of the periodic table. They have similar chemical properties but exhibit different reactivities.

2. **Bond Strength**:
- The bond strength between nitrogen atoms (N≡N) is significantly stronger than the bond between phosphorus atoms (P≡P).
- The triple bond in nitrogen (N≡N) is one of the strongest bonds in chemistry, which makes nitrogen molecules (N2) very stable and less likely to react with other substances.
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