An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell.
Identify the element X. How many valence electrons does it have?

Explanation

To solve the question, we will follow these steps:

### Step 1: Identify the Element X
- The question states that element X belongs to group 15 of the periodic table and exists as a diatomic molecule.
- The elements in group 15 include nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi).
- Among these, nitrogen (N) is the only element that exists as a diatomic molecule (N₂) under standard conditions.

### Step 2: Confirm the Reaction with Hydrogen
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