- **Neon (Option 1):**
- Symbol: Ne
- Neon is a noble gas.
- It is colorless and odorless.
- Used in neon lights due to its bright glow.

- **Krypton (Option 2):**
- Symbol: Kr
- Another noble gas.
- Found in trace amounts in the atmosphere.
- Used in lighting and photography.

- **Argon (Option 3):**
- Symbol: Ar
- A common noble gas.
- Used in welding and preserving historical documents.

- **Oxygen (Option 4):**
- Symbol: O
- Not a noble gas.
- Essential for respiration in most living organisms.
- Highly reactive and forms compounds easily.

**✅ Option 4 - Oxygen is the correct answer.**
YOUR ANSWER IS RIGHT