Which of these is a noble gas?

Options

A. Hydrogen
B. Nitrogen
C. Oxygen
D. Neon

Answer

**Step-by-Step Solution:**

1. **Identify the Elements Given**: The question provides four elements: hydrogen, nitrogen, oxygen, and neon.

2. **Understand Noble Gases**: Noble gases are elements that are found in Group 18 of the periodic table. They are characterized by having a full valence shell, which makes them very stable and unreactive.

3. **List the Noble Gases**: The noble gases include:
- Helium (He)
- Neon (Ne)
- Argon (Ar)
- Krypton (Kr)
- Xenon (Xe)
- Radon (Rn)

4. **Compare the Given Elements with Noble Gases**: Now, we will compare the elements given in the question with the list of noble gases:
- Hydrogen (H) is not a noble gas.
- Nitrogen (N) is not a noble gas.
- Oxygen (O) is not a noble gas.
- Neon (Ne) is a noble gas.

5. **Select the Correct Answer**: Based on the comparison, the only noble gas among the options provided is neon.

6. **Conclusion**: Therefore, the correct answer to the question "Which of these is a noble gas?" is neon.

**Final Answer**: Neon (Option 4).

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